Question

A triangle has one 80° angle and two sides that each measure 10 cm in length. Which are the measures of the other two angles?

A.10° and 10°
B.20° and 20°
C.40° and 40°
D.50° and 50°

Answer 1

D. 50° and 50°.

Explanation:

80° + 50° + 50° = 180°.

Answer 2

D.50° and 50°

Explanation:

Whenever we have a triangle the sum of its internal angles must result in 180°

We can test case by case to see how much it gives us as a result

A)

80° + 10° + 10° = 100°

Wrong answer

B)

80° + 20° + 20° = 120°

Wrong answer

C)

80° + 40° + 40° = 160°

Wrong answer

D)

80° + 50° + 50° = 180°

Correct answer

Only option D is possible