Question

13. Which angle is equal to two-third of its supplement?

Answer 1

Answer:

let the angle be x

x = 2/3(180-x)

3x=2(180-x)

3x=360-2x

5x=360

x  =72

so, 72 = 2/3(180-72)

    72  =2/3(108)

the angle 2/3 of its supplement is 72

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