Common Core Aligned Lesson Plan
Subject: Geometry
Unit: Properties of a Triangle
Week: 5
Teacher: Mr. Ives
LESSON ELEMENT: Triangle Sum and Exterior Angle Theorems
Common Core Learning Standards Addressed:
Grade: 10-11
Day: 4
Rocinante High School
STUDENT-FRIENDLY TRANSLATION
7-G.02 (Draw (freehand, with ruler and protractor, and with technology) geometric shapes with given conditions. Focus on constructing triangles from three measures of angles or sides, noticing when the
conditions determine a unique triangle, more than one triangle, or no triangle.)
G-CO.06;
G-CO.10 (Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangles are congruent; the segment joining midpoints of two
sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point.)
Learning Goals and Objectives: (What will students know & be able
to do as a result of this lesson?)
The student ill be able to determine if three given lengths can
denote a triangle and the will be able to find a missing angle
given the other two angles.
The student will be able to find the external angle of a triangle
given the two remote angles and find a remote angle given the
other remote angle and the corresponding exterior angle.
I can use the Triangle sum
theorem and thee Exterior
Angle Theorem.
Vocabulary Support: (What vocabulary will student need for this
lesson?)
rigid, scalene triangle, equilateral triangle, isosceles triangle,
midsegment, adjacent interior angles, remote interior angles,
exterior angles, vertex angle of an isosceles triangle, altitude, and
median.
I understand the vocabulary
of triangles.
Formative Assessment Criteria for Success: (What does success on
this lesson’s outcomes look like?)
The student will complete the assignment with a rubric of 7 or
higher.
All notes and diagrams will be complete in their data folder.
I will complete the
assignment.
Activities/Tasks: (What learning experiences will students engage in?)
Slideshow on triangles
Related Technology video
Agile Mind animations
Guided Practice
Independent practice
Vocabulary graphic organizer
Student reflection on learning.
Resources/Materials: (What texts, digital resources, & materials will be used in this lesson?)
A combination of :
Agile Mind software and resources
Technology / Science / mathematics slideshow
Education Youtube videos
Glencoe Geometry textbook and resources
Glencoe Algebra II textbook and resources
Holt Algebra I Textbook and resources
manipulatives and Puzzles
Geometric Templates and drawing tools
laptop computer
pencil and paper
Vocabulary Graphic Organizer
Data folder and formula sheet
Actual Lesson Timeline:
Slideshow on triangles
Related Technology video
Agile Mind animations
Guided Practice
Independent practice
Vocabulary graphic organizer
Student reflection on learning.
Modifications/Accommodations: What curriculum modifications and classroom accommodations will you
make for Students with Disabilities in your class?
Extended time for completion of assignments or tests.
Additional time for reading assignments.
Time for repeated drill and review.
small groups.
Data folders with study sheets, vocabulary sheets, and other supplemental aids.
Visual demonstrations which include the presentation of material in small steps.
Multisensory materials and activities (written, spoken, demonstration, kinesthetic.)
Mnemonic devices and aids.
Word processor with spell checker and calculator as well as graphing calculator.
Assisted note-taking and note-taking guidelines.
Credit for participation, effort and attendance as well as completed work.
One-to-one teacher contact daily.
Assistance with organization and planning as well as organized classroom procedures and
materials.
Peer / pair tutoring and cooperative learning.
Emphasis on success.
Seating to reduce distractions.
Clearly defined limits and classroom procedures.
Cooling off periods and concrete, positive re-enforcement.
 Does this lesson reflect one of the Common Core shifts in instruction (See: Common Core Shifts
EngageNY.org)
 In addition, please choose ONE question below to respond to after you have taught the lesson
OR create your own question and respond to it after you have taught the lesson.
1. How did this lesson support 21st Century Skills?
2. How did this lesson reflect academic rigor?
3. How did this lesson cognitively engage students?
4. How did this lesson engage students in cooperative learning and cooperative learning skills?
5. How effective was the work in this lesson?
Common Core Aligned Lesson:
Reflection
+ Agile Mind animations are excellent for the Triangle Inequality.
- Agile Mind does NOT have enough practice on using the Exterior Angle Theorem.
∆ Add practice from other resources.