The measure of the angle's supplement is 60

° more than four times that of its complement. Find the measure of the angle described

80°

Step-by-step explanation:

Let the angle be x then four times it's complement plus 60, that is

4 (90 - x) + 60 ← is it's supplement

Supplementary angles sum to 180°

Sum the angle and it's supplement and equate to 180

x + 4 (90 - x) + 60 = 180 ← distribute and simplify left side

x + 360 - 4x + 60 = 180

- 3x + 420 = 180 (subtract 420 from both sides)

- 3x = - 240 (divide both sides by - 3)

x = 80

The required angle = x = 80°

supplement = 4 (90 - 80) + 60 = 4 * 10 + 60 = 40 + 60 = 100°