Question

find the angle which is equal to its supplement​

Answer 1

90° because it's supplement is also 90° since if we add up both, the sum is 180° which is the sum total of supplementary angles.

Mathematically,
let the angle be x°.
so,x+x=180
=>2x=180
=>x=90

hope it helps

Answer 2

Answer:

90°

Step-by-step explanation:

Let the angle be x

Both supplements are equal

x+x=180

2x=180

x=180/2

x=90