Question

if two supplementary angles are equal what is the size of each ?

Answer 1

If two supplementary angles are equal:
The answer is;
Supplementary angle =180 degree
equal supplements = 180/2
=90°

Therefore : 90 +90 (equal supplements) = add up to give a supplementary angle.

The answer is 90° each.

Hope this helps you :) :)
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Answer 2

Two angles are called complementary when their measures add to 90 degrees. Two angles are called supplementary when their measures add up to 180 degrees.