contestada

Exterior Angle Theorem
The exterior angle of a triangle is equal to the
sum of the two opposite interior angles.
Exterior Angle
d=a+b
b
STATEMENTS
2 opposite
interior angles
(3) Please prove the
Exterior Angle Theorem
(4 pts)
REASONS
(4) Please write the proof for the theorem shown below:
[HINT: Draw an auxiliary line from A to BC either bisecting ZA or bisecting BC segment]
W, S
DI
ST
BAD
PC