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Let one angle = x

other angle = 4x

since they are complementary, their sum = 90

⇒ x+ 4x = 90

⇒ 5x = 90

⇒ x = 90/5 = 18

4x = 18×4 = 72

Angles are 18 and 72 degrees.

other angle = 4x

since they are complementary, their sum = 90

⇒ x+ 4x = 90

⇒ 5x = 90

⇒ x = 90/5 = 18

4x = 18×4 = 72

Angles are 18 and 72 degrees.

and 2nd angle = y

x+y=90

y=4x

therefore

x+4x=90

5x=90

x=90/5

x=18

angles are: 18 & 72