Question

select the correct choice that completes the sentence below. the measure of an angle that is its own supplement is

Explanation:

Step1: Recall the definition of supplementary angles

Two angles are supplementary if their sum is 180 degrees. Let the angle be $x$. Its supplement is also $x$. So we have the equation $x + x=180$.

Step2: Solve the equation

Combining like - terms, we get $2x = 180$. Dividing both sides of the equation by 2, we have $x=\frac{180}{2}=90$.

Answer:

90 degrees