Question

What are complementary​ angles? Describe how to find the measure of an​ angle's complement.
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Part 1
Choose the correct answer below.
A.
Two angles whose measures have a difference of 90degrees are called complementary angles. To find to measure of an​ angle's complement, add the measure of the angle to 90degrees.
B.
Two angles whose measures have a sum of 180degrees are called complementary angles. To find to measure of an​ angle's complement, subtract the measure of the angle from 180degrees.
C.
Two angles whose measures have a sum of 90degrees are called complementary angles. To find to measure of an​ angle's complement, subtract the measure of the angle from 90degrees.
D.
Two angles whose measures have a difference of 180degrees are called complementary angles. To find to measure of an​ angle's complement, add the measure of the angle to 180degrees.

Answer 1

C.

Complementary angles are two angles whose measures add to 90°. To find an angle's complement, subtract its measure from 90° (e.g., the complement of a 30° angle is 90° − 30° = 60°).