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Answer:
An angle is one fifth of it's supplement .
let the angle be x
x = 90-x × ⅕
x = 90-x/5
5x = 90 - x
5x + x = 90
6x = 90
x = 90/6
x = 15
Therefore the measure of the angle is 15°
If the measure of an angle is 20° then the measure of it supplement is ?
measure of angle = 20°
let is supplement be y
y + 20 = 180°
y = 180-20
y = 160°
therefore the answer is 160°