Question

What is the measure of angle B?

Answer 1

60 degrees

Explanation:

all triangles have angles making 180 degrees. so 80+40=120

180-120=60

Answer 2

b = 60

Explanation:

We know: The sum of measures of angles in a triangle is equal to 180°.

Therefore we have the equation:

b° + 80° + 40° = 180° combine like terms

b° + 120° = 180° subtract 120° from both sides

b° + 120° - 120° = 180° - 120°

b° = 60°