Learning Objective
Name __________________________
Today, we will classify1 triangles by their attributes.
1
put into groups
CFU
What are we going to do today?
What does classify mean? Classify means __________.
Activate (or Provide) Prior Knowledge
A triangle is a shape with three sides and three angles.
Which two triangles are the same?
1.
A
B
C
2.
A
B
C
CFU
Students, you already know that some triangles look the same. Triangles that are the same can sometimes be classified into groups.
Today, we will classify triangles by their attributes.
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3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Concept Development
Triangles can be classified by their attributes2.
• The attributes of a triangle are the sides and angles.
2
features
Classifying Triangles by:
Sides
Angles
Equilateral
Isosceles
Scalene
Right
An equilateral triangle has
three equal sides.
An isosceles triangle has
two equal sides.
A scalene triangle has
no equal sides.
A right triangle has
one right angle.
3 cm
3 cm
4 cm
2 cm
5 cm
6 cm
6 cm
3 cm
CFU #1
4 cm
Go to
Skill Dev.
• A right angle is a 90° angle.
Which of the following is an equilateral triangle? How do you know?
A
5 in
5 in
B
6 in
4 in
7 in
5 in
What is the difference between an equilateral triangle and an isosceles triangle?
Which of the following is a scalene triangle? How do you know?
A
4 in
5 in
6 in
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B
4 in
4 in
Flashcards
Right Triangles
CFU #2
Which of the following is a right triangle?
How do you know?
A
6 in
9 in
8 in
6 in
3rd
B
6 in
10 in
8 in
Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Skill Development/Guided Practice
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
Classifying Triangles by Sides
An equilateral triangle
has three equal sides.
3 cm
An isosceles triangle
has two equal sides.
4 cm
3 cm
2 cm
6 cm
3 cm
Classify triangles by their attributes.
4 cm
A scalene triangle
has no equal sides.
5 cm
6 cm
Step #1: Look at the triangle carefully.
a. Identify3 equal sides on the triangle. (circle)
Step #2: Classify the triangle by its sides. “The triangle is a(an) ______ triangle because _______________.”
3 find
10 cm
A
B
10 cm
8 cm
8 cm
10 cm
“The triangle is an equilateral triangle
because it has three equal sides.”
“The triangle is an equilateral triangle
because it has three equal sides.”
C
6 cm
8 cm
6 cm
7 cm
D
5 cm
8 cm
“The triangle is an isosceles triangle
because it has two equal sides.”
5 cm
“The triangle is an isosceles triangle
because it has two equal sides.”
CFU
(#1a) How did I/you identify equal sides on the triangle?
(#2) How did I/you classify the triangle by its sides?
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3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Skill Development/Guided Practice (continued)
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
Classifying Triangles by Sides
An equilateral triangle
has three equal sides.
3 cm
3 cm
4 cm
4 cm
A scalene triangle
has no equal sides.
2 cm
6 cm
3 cm
Classify triangles by their attributes.
An isosceles triangle
has two equal sides.
5 cm
6 cm
Step #1: Look at the triangle carefully.
a. Identify equal sides on the triangle. (circle)
Step #2: Classify the triangle by its sides. “The triangle is a(an) ______ triangle because _______________.”
4 in
E
8 in
10 in
“The triangle is a scalene triangle
because it has no equal sides.”
F
5 cm
3 cm
7 cm
“The triangle is a scalene triangle
because it has no equal sides.”
Return to
Concept
CFU
(#1a) How did I/you identify equal sides on the triangle?
(#2) How did I/you classify the triangle by its sides?
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3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Relevance
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
1. Classifying triangles will help you create interesting designs.
Triangles in paintings.
Triangles in buildings.
2. Classifying triangles will help you do well on tests.
CFU
Does anyone else have another reason why it is relevant to classify triangles by their attributes? (pair-share) Why is it relevant to classify
triangles by their attributes? You may give me one of my reasons or one of your own. Which reason is more relevant to you? Why?
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3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
Classifying Triangles by Sides
An equilateral triangle
has three equal sides.
3 cm
Skill Closure
3 cm
An isosceles triangle
has two equal sides.
4 cm
2 cm
6 cm
3 cm
Classify triangles by their attributes.
4 cm
A scalene triangle
has no equal sides.
5 cm
6 cm
Step #1: Look at the triangle carefully.
a. Identify equal sides on the triangle. (circle)
Step #2: Classify the triangle by its sides. “The triangle is a(an) ______ triangle because _______________.”
A
7 cm
7 cm
B
5 cm
5 cm
7 cm
9 cm
“The triangle is an equilateral triangle
because it has three equal sides.”
“The triangle is an isosceles triangle
because it has two equal sides.”
Constructed Response Closure
What is the missing side length that will
make the triangle an equilateral triangle?
How do you know?
2 in
2 in
?
Summary Closure
What did you learn today about classifying triangles by their attributes? (pair-share)
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3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Independent Practice
Name ________________________
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
Classifying Triangles by Sides
An equilateral triangle
has three equal sides.
3 cm
An isosceles triangle
has two equal sides.
4 cm
3 cm
2 cm
6 cm
3 cm
Classify triangles by their attributes.
4 cm
A scalene triangle
has no equal sides.
5 cm
6 cm
Step #1: Look at the triangle carefully.
a. Identify equal sides on the triangle. (circle)
Step #2: Classify the triangle by its sides. “The triangle is a(an) ______ triangle because _______________.”
A
B
8 cm
6 cm
8 cm
8 cm
6 cm
4 cm
“The triangle is an equilateral triangle
because it has three equal sides.”
“The triangle is an isosceles triangle
because it has two equal sides.”
C
9 cm
10 cm
8 cm
“The triangle is a scalene triangle
because it has no equal sides.”
DataWORKS Educational Research
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©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Periodic Review 1
Name ________________________
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
Classifying Triangles by Sides
An equilateral triangle
has three equal sides.
3 cm
An isosceles triangle
has two equal sides.
4 cm
3 cm
2 cm
6 cm
3 cm
Classify triangles by their attributes.
4 cm
A scalene triangle
has no equal sides.
5 cm
6 cm
Step #1: Look at the triangle carefully.
a. Identify equal sides on the triangle. (circle)
Step #2: Classify the triangle by its sides. “The triangle is a(an) ______ triangle because _______________.”
A
B
39 in
15 in
12 cm
12 cm
36 in
12 cm
“The triangle is a scalene triangle
because it has no equal sides.”
“The triangle is an equilateral triangle
because it has three equal sides.”
8 in
C
14 in
12 in
“The triangle is a scalene triangle
because it has no equal sides.”
DataWORKS Educational Research
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©2012 All rights reserved.
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3 cm
D
2 cm
2 cm
“The triangle is an isosceles triangle
because it has two equal sides.”
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Periodic Review 2
Name ________________________
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
Classifying Triangles by Sides
An equilateral triangle
has three equal sides.
3 cm
3 cm
An isosceles triangle
has two equal sides.
4 cm
4 cm
2 cm
6 cm
3 cm
Classify triangles by their attributes.
A scalene triangle
has no equal sides.
5 cm
6 cm
Step #1: Look at the triangle carefully.
a. Identify equal sides on the triangle. (circle)
Step #2: Classify the triangle by its sides. “The triangle is a(an) ______ triangle because _______________.”
A
10 cm
7 cm
8 in
B
4 in
6 in
7 cm
“The triangle is an isosceles triangle
because it has two equal sides.”
“The triangle is a scalene triangle
because it has no equal sides.”
4 in
C
20 cm
28 cm
D
4 in
4 in
20 cm
“The triangle is an isosceles triangle
because it has two equal sides.”
DataWORKS Educational Research
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©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
“The triangle is an equilateral triangle
because it has three equal sides.”
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Periodic Review 3
Name ________________________
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
Classifying Triangles by Sides
An equilateral triangle
has three equal sides.
3 cm
3 cm
An isosceles triangle
has two equal sides.
4 cm
2 cm
6 cm
3 cm
Classify triangles by their attributes.
4 cm
A scalene triangle
has no equal sides.
5 cm
6 cm
Step #1: Look at the triangle carefully.
a. Identify equal sides on the triangle. (circle)
Step #2: Classify the triangle by its sides. “The triangle is a(an) ______ triangle because _______________.”
A
16 in
16 in
B
25 cm
16 in
25 cm
“The triangle is an equilateral triangle
because it has three equal sides.”
C
14 cm
14 cm
“The triangle is an isosceles triangle
because it has two equal sides.”
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“The triangle is an equilateral triangle
because it has three equal sides.”
9 in
22 cm
DataWORKS Educational Research
25 cm
D
7 in
5 in
“The triangle is a scalene triangle
because it has no equal sides.”
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Flashcards (Right Triangles)
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
A right triangle has one right angle.
• A right angle is a 90° angle.
Teacher
with CFU
Right Triangle
Is the triangle a right triangle?
How did I know if the triangle was a right triangle?
DataWORKS Educational Research
(800) 495-1550 •www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Flashcards (Right Triangles)
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
A right triangle has one right angle.
• A right angle is a 90° angle.
Student
with CFU
Right Triangle
Is the triangle a right triangle?
How did you know if the triangle was a right triangle?
DataWORKS Educational Research
(800) 495-1550 •www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Flashcards (Right Triangles)
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
A right triangle has one right angle.
• A right angle is a 90° angle.
Right Triangle
Teacher
with CFU
Is the triangle a right triangle?
How did I know if the triangle was a right triangle?
DataWORKS Educational Research
(800) 495-1550 •www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Flashcards (Right Triangles)
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
A right triangle has one right angle.
• A right angle is a 90° angle.
Right Triangle
Student
with CFU
Is the triangle a right triangle?
How did you know if the triangle was a right triangle?
DataWORKS Educational Research
(800) 495-1550 •www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Flashcards (Right Triangles)
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
A right triangle has one right angle.
• A right angle is a 90° angle.
Right Triangle
Student
Is the triangle a right triangle?
DataWORKS Educational Research
(800) 495-1550 •www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Flashcards (Right Triangles)
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
A right triangle has one right angle.
• A right angle is a 90° angle.
Right Triangle
Student
Is the triangle a right triangle?
DataWORKS Educational Research
(800) 495-1550 •www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Flashcards (Right Triangles)
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
A right triangle has one right angle.
• A right angle is a 90° angle.
Right Triangle
Student
Is the triangle a right triangle?
DataWORKS Educational Research
(800) 495-1550 •www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Flashcards (Right Triangles)
Triangles can be classified by their attributes.
• The attributes of a triangle are the sides and angles.
A right triangle has one right angle.
• A right angle is a 90° angle.
Return to
Concept
Right Triangle
Student
with CFU
Is the triangle a right triangle?
How did you know if the triangle was a right triangle?
DataWORKS Educational Research
(800) 495-1550 •www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
EDI – Cognitive, Teaching and English Learners Strategies
Learning Objective : Classify triangles by their attributes.
Cognitive Strategies
Teaching Strategies
Elaboration
Demonstration
Targeted vocabulary: classify, triangles, attributes, equilateral, isosceles, scalene, right, right angle, identify
Language Strategies
Vocabulary Words
Academic
classify, identify
Content
triangles, attributes
Support
equilateral, isosceles, scalene, right, right angle
Multiple-Meaning
right
Synonym
Vocabulary
Strategy
Definition
classify, identify, equilateral, isosceles, scalene, right angle
Homophone
Internal Context Clue
Listen, Speak
Read
Similar Sounds
Tracked Reading
Decoding Rules
Write
Writing
Content Access Strategies
Comprehensible
Input
Cognates
Graphic Organizer
Contextual Clues
Contextualized
Definitions
Pictures
DataWORKS Educational Research
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©2012 All rights reserved.
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3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.
Blank Page
DataWORKS Educational Research
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©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 2.2 (2Q)
Identify attributes of triangles (e.g.; two equal sides for the isosceles triangle, three
equal sides for the equilateral triangle, right angle for the right triangle).
Lesson to be used by EDI-trained teachers only.