Question

What is the measure of angle b in degrees

Answer 1

∠ B = 119°

Explanation:

∠ C and 112° are adjacent angles and supplementary, thus

∠ C = 180° - 112° = 68°

The external angle of a triangle is equal to the sum of the 2 opposite interior angles.

∠ B is an exterior angle of the triangle, thus

∠ B = 51° + ∠ C = 51° + 68° = 119°

Answer 2

B=119

Explanation:

C=180-112=68

68+51=119

A=180-119=61

180-61=119

B=119