Question

Two angels are equal and supplementary to each other. Find them

Answer 1

each angle is of 90°
90°+90°=180°.
supplementary angle is 180°
the two angles who are supplementary to each other have to be equal.
so
x+x=180°
2x=180°
x=180°÷2
x=90°

Answer 2

supplementary has addition of 180degree
  in question its given that they are equal
      so   2x=180
              x=90
        both angles measure 90degree

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