Download Geometry 7-3 Exterior Angles.notebook

Geometry 7­3 Exterior Angles.notebook
Exterior Angles
• Students will review the different type of angles.
• Students will calculate the exterior angles.
Geometry
Butterflies, Pinwheels and Wallpaper
1. If <8 = 49 , determine the measures of the other seven angles.
o
TEKs
8.8A ­ Write one­variable equations or inequalities with variables on both sides that represent problems using rational number coefficients and constants 8.8C ­ Model and solve one­variable equations with variables on both sides of the equal sign that represent mathematical and real­world problems using rational number coefficients and constants 2. Find the value of the missing angle x.
x
8.8D ­ Use informal arguments to establish facts about the angle sum and exterior angle of triangles, the angles created when parallel lines are cut by a transversal, and the angle­angle criterion for similarity of triangle 35o
answers
3. Find the value of x.
xo
xo
Lines C and D are cut by transversal t. Which of the following is true?
m<1 = m<6
m<8 = m<2
Title Page
Math Humor ANSWERS
(x ­ 12)o
2. 55o
3. x = 64
4. C m<4 = m<7
m<3 = m<2
Warm Up
Cut and tape Labsheet in your journal
3.0
Congruent or
Supplementary?
7
Pull
1 2
3 4
5 6
8
What is the measure of the exterior angle TUG?
Math Humor
Labsheet
Build an igloo...
build a sand castle?
Find a friend and tell them what an exterior angle is.
Friend Transition
Would You Rather?
1
Geometry 7­3 Exterior Angles.notebook
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Date
Exterior Angles
1. What are • interior ­ inside the shape
interior and exterior angles? • exterior ­ outside the shape
2. How to find • the sum of the interior and the measure of exterior angle equals 180o
the exterior • any exterior angle equals angle?
the sum of the two interior angles across
180o
Notes
Activity ­ Exterior Angle Maze
Notes
Closing Questions
Which angles are next to
one another? (adjacent)
How do you calculate
the exterior angles? (subtract from 180)
Activity
Closing Questions
2