angle a + angle b + angle c = 180 because the 3 interior angles of a triangle add to 180.
now, angle a is 40 degrees, because the 40 degree angle and angle a are corresponding angles (parallel lines and transversals).
The triangle is isosceles, so angle a = angle c. Angle c is 40 degrees, and by corresponding angles, the supplement of angle e is 40 degrees.
180-40=140
angle e is 140 degrees
180+140=320
The answer is 320. Sorry if it isn't really well explained, I'm not the best at explaining things.
Edit: 5 seconds after posting, i realize i said 220 instead of 320. Simple math mistake!
:9
