IXL | Find measures of complementary, supplementary, vertical, and adjacent angles | 8th grade math

or

The measure of an angle is 71°. What is the measure of its supplementary angle?

°

ref_doc_title.

or

Learn with an example

question

The measure of an angle is 57°. What is the measure of its complementary angle?

°

key idea

Complementary angles have measures that add to 90°.

A

B

C

D

ABC and

CBD are complementary angles.

solution

Since the angles are complementary, their measures must add to 90°. Set up an equation and solve for n.

n

+

57°

=

90°

n

+

57°

−

57°

=

90°

−

57°

n

=

33°

The measure of the complementary angle is 33°.

Looking for more? Try these:

Lesson: Complementary angles

Lesson: Supplementary angles

Lesson: Vertical angles

Lesson: Adjacent angles

or

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Teacher tools

Work it out

Not feeling ready yet? These can help:

P.1Identify complementary, supplementary, vertical, adjacent, and congruent angles

T.6Solve one-step equations

Lesson: Complementary angles

Lesson: Supplementary angles

Lesson: Vertical angles

Lesson: Adjacent angles