If you have a triangle with 3 angles and it equals 180. One angle is right and two are acute one is 4 times bigger than the other. How do you find the angles?

Let an unknown angle=x, then we have 4x, being the other unknown angle, but:

x + 4x =90

5x=90 divide both sides by 5

x=90/5

x=18 degrees-one of the unknown angle,

18 X 4=72 degrees, the 2nd unknown angle.