Question

The measure of an angle is 138°. What is the measure of its supplementary angle?

Answer 1

The  measure of its supplementary angle is 42 degrees

The sum of supplementary angle is qual to 180 degrees

Let the required angle be x

The sum of the supplements of 138 degrees will be expressed as:

x + 138 = 180

x= 180 - 138

x = 42 degrees

Hence the  measure of its supplementary angle is 42 degrees

Learn more on supplementary angles here: brainly.com/question/8615095

Answer 2

Step-by-step explanation:

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Measure of one angle is 138°

We know sum of two sides of supplementary angle is 180°

So, one side is 138° and let other side be x

Then,

138°+x = 180°

x=180°-138°

x=42°

Hope it helps you