Question

What is the measure of B?

Select the best answer from the choices provided.
A.33°
B. 57
C. 770
D.123

Answer 1

The angle sum property of a triangle:

• The total measure of the three angles of a triangle is 180°

∠A + ∠B + ∠C = 180°

• ∠A = 58°
• ∠B = 65°
• ∠C = x

⇛58° + 65° + x = 180°

⇛123° + x = 180°

⇛x = 180° - 123°

⇛x = 57°

Option B is the correct answer

Answer 2

B =57

Explanation:

The sum of the angles of a triangle is 180

A+B+C = 180

58+B+65 = 180

123+B = 180

B = 180-123

B =57