Question

The measure of an angle is 51°.

What is the measure of its supplement?

A.
39°

B.
49°

C.
129°

D.
139°

Answer 1

Here you need to know that supplement is Equal to 180

Here how u would do it
51+ x=180
solve for x
x=180 - 51
x= 129

So c is the answer to your question

Answer 2

The measure of the supplement of the given angle 51° is 129°.

What is the supplement of an angle?

When one angle α is a supplement of other angle β then

α+β = 180.

It is given that

α = 51°

β = 180-α

β = 180-51°

β = 129°

Therefore, the measure of the supplement of the given angle 51° is 129°.

To get more about supplement visit:

https://brainly.com/question/1045562