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22-09-2019
Engineering

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If angle A is a complement of angle B, angle B and angle C are vertical angles, and the supplement of C has a measure of 140°. Find the measure of A.

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MathPhys MathPhys

22-09-2019

Answer:

50°

Explanation:

Complementary angles add up to 90°.

Supplementary angles add up to 180°.

Vertical angles are equal.

A + B = 90°

B = C

C = 180° − 140°

C = 40°

B = 40°

A = 50°

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