If you mean complementary angles which add up to 90 degrees then 4 times 90 = 360 degrees which is a full turn.
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measure of angle = 73 work x = angle (90 - x) = complement x = 4 (90 - x) + 5 x = 360 - 4x + 5 x = 365 - 4x x + 4x = 365 - 4x + 4x 5x = 365 5x / 5 = 365 / 5 x = 73
Suppose the angle is x then its complement is 90-x So 4*(90-x) = x or 360 - 4x = x so that 360 = 5x => x = 72 degrees
A1 + A2 = 90 A1 = 4*A2 Substituting from the second equation into the first: 4*A2 + A2 = 90 or 5*A2 = 90 so that A2 = 18 and then, by the second equations, A1 = 4*18 = 72
A right angle is a measure of 90 degrees or a 1/4 of a turn
It is pi/4 radians.