The measure of an angle is 78°. What is the measure of a complementary angle?

Question

Mathematics

Eliza

29 January, 21:36

The measure of an angle is 78°. What is the measure of a complementary angle?

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Answers (2)

Know the Answer?

Marisol Brooks · Answer 1

Complementary angles add up to 90°.

It is given that one angle is 78°.

Let the other angle be x.

Therefore x+78=90

x=90-78

x=12°

Brayden Thompson · Answer 2

First you need to know the definition of a complementary angle. That means that two angles add up to 90 degrees, or a right angle.

To find an angle complementary to a 78 degree angle, you need to subtract 78 from 90.

90 - 78 = 12