Denise Keen
MATH 5313
Dr. Wheeler
November 14, 2011
Geometry Activity
Angles, Angles, Everywhere
Teacher Notes
Lesson Objective:
 The student will use angle measurement to classify angles as acute, right, or obtuse.
 The student will identify relationships involving angles in triangles and quadrilaterals.
Grade Level: Grade 6 (Mathematical Investigations)
Prior Knowledge:
 The student should be able to identify and describe right, acute, and obtuse angles
(TEKS 4.8a).
TEKS: 6.6
Geometric and spatial reasoning: The student uses geometric vocabulary to describe angles,
polygons, and circles. The student is expected to:
a. Use angle measurement to classify angles as acute, obtuse or right.
b. Identify relationships involving angles in triangles and quadrilaterals.
Vocabulary:
acute, angle, degree, obtuse, parallelogram, quadrilateral, rectangle, square, straight angle,
triangle, trapezoid
Time Frame: 90 minute class period
Materials:
 Student’s notes
 Pencil
 Scavenger hunt worksheet
Procedures:
A Power Point lesson (soft copy attached) has been created that will review prior knowledge,
introduce learning objectives, teach necessary vocabulary, and introduce the angle properties
of a triangle, square, rectangle, parallelogram, and trapezoid. Students will be expected to
follow along with the Power Point presentation, filling in the blanks in their notes as the lesson
progresses. Be sure to read the slides aloud for those students that struggle with reading,
provide prompts for filling in the notes, and allow students to vocalize examples and questions
as the lesson moves forward. The lesson should take approximately 30 minutes.
dkeene@twu.edu
Nov 2011
Page 1
Following the Power Point lesson, students will be placed in groups and will conduct a
scavenger hunt. Groups have been predetermined (see attachment) so that academically
stronger students can be strategically placed with academically weaker students. The
scavenger hunt will be conducted on the playground and will require students to find “real life”
examples of acute, obtuse, and right angles. The students will have 20 minutes to conduct the
scavenger hunt.
Once the scavenger hunt has been completed, the students will return to the classroom and a
comprehensive list (listing each item under the correct angle classification) will be developed.
There should be approximately 30 minutes left within the class period to complete the list.
Each student will receive a copy of the comprehensive list to use in conjunction with their notes
as a resource for quiz/test preparation.
Scaffolding Questions (within Power Point presentation):
 If we know that the sum of all angles in a triangle equals 180°, then what is the measure
of the missing angle?
 If we know that the sum of all angles in a square equals 360°, then what is the measure
of the missing angle?
 If we know that the sum of all angles in a rectangle equals 360°, then what is the
measure of the missing angle?
 If we know that the sum of all angles in a parallelogram equals 360°, then what is the
measure of the missing angle?
 If we know that the sum of all angles in a trapezoid equals 360°, then what is the
measure of the missing angle?
Differentiation:
 Read slides aloud throughout the lesson
 Provide students with the teacher’s copy of notes
 Pairing up students to include a mix of academic abilities
 Provide students with a copy of comprehensive list
Following the lesson teaching students to distinguish between acute, obtuse, and right triangles
and to recognize the relationships between triangles, quadrilaterals, and their angles, students
will be placed in groups and will conduct a scavenger hunt. Groups will be predetermined so
that academically stronger students can be strategically placed with academically weaker
students. The scavenger hunt will be conducted on the playground and will require students to
find “real life” examples of acute, obtuse, right, and straight angles, as well as triangles (right,
acute, obtuse, equilateral, scalene, isosceles) and quadrilaterals (square, rectangle, rhombus,
parallelogram, trapezoid). Once the scavenger hunt has been completed, a comprehensive list
(listing item, classification, and total angle measure) will be compiled and each student will
receive a copy to use as a resource for quiz/test preparation.
dkeene@twu.edu
Nov 2011
Page 2