IXL | Find measures of complementary and supplementary angles | 7th grade math

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The measure of an angle is 124°. What is the measure of its supplementary angle?

°

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Learn with an example

question

What is the value of c?

150°

c

°

key idea

Supplementary angles have measures that add to 180°. When a straight line is divided into two adjacent angles, supplementary angles are formed.

solution

150°

c

Add the measures of the supplementary angles and set the sum equal to 180°. Then solve for c.

150° + c	=	180°

c	=	180° − 150°

c	=	30°

So, c = 30°.

Looking for more? Try these:

Lesson: Complementary angles

Lesson: Supplementary angles

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Work it out

Not feeling ready yet? These can help:

Identify complementary and supplementary angles

T.6Solve one-step equations

Lesson: Complementary angles

Lesson: Supplementary angles