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math422dec192016.notebook
# sides
meas.
1 ext angle
meas 1 int angle
December 19, 2016
math422dec192016.notebook
December 19, 2016
hw due Tuesday Geometry p. 112 chapter test 7,8,10 p. 110#1­11
TEST WEDNESDAY
Please take out your handout with all the polygons on the first page.(12/15)
fill in the reasons for this proof
Given B
E
Statements Reasons
1. 2. 1.
2.
3.
4. 4.
A
C
D
math422dec192016.notebook
December 19, 2016
math422dec192016.notebook
December 19, 2016
Proof that the sum of the exterior angles of a polygon is 360 degrees.
The measures of the interior angles of a polygon with n sides + measures of the exterior angles of a polygon with n sides = 180n
(n­2) 180 + sum ext. angles = 180n
180n ­ 360 + sum exterior angles = 180n
sum exterior angles = 360
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