Here is my query

Find two supplementary angles one of which is four fifth of the other?

 LET ONE SUPPLEMENTARY ANGLE BE 'x'.

THE EQUATION WILL BE:-

x + 4/5x=180 degrees

5/5x + 4/5x=180 degrees

9/5x=180 degrees

x=100 degrees

4/5x=100 x 4/5

       =80 degrees

THEREFORE,THE SUPPLEMENTARY ANGLES ARE 100 AND 80 DEGREES.

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