Answer:
C
Step-by-step explanation:
Alright. So just from looking at the picture, you can tell that the triangle is isosceles. It's useful to memorize the picture I've provided.
<A ~= <B
40 = <B
The angles in a triangle add up to 180.
180- <A - <B = 180 - 40 - 40 = 100
That means angle C is 100 degrees.
