Question

In triangle ABC, what is m and B

A. 30°
B. 40°
C. 75°
D. 85°

Answer 1

B) 40

Explanation:

Answer 2

B. 40

Explanation:

Angle C is linear with ACD, so the 2 angles = 180 degrees. 180 - 155 = 25.

All 3 angles need to add to 180, so 115 + 25 + angle B = 180

140 + angle B = 180, so angle B is 40 degrees.