Question

Prove that the sum of angles of a triangle is two right angles.If in a right triangle an acute angle is one-fourth the other,find the acute angle.Please reply fast tomorrow is my exam.

Answer 1

let the acute angle be x
x+1/4x+90=180
5x/4=90
x=90*4/5
x=18*4
x=72.
sum of angles of a triangle =180
sum of two right angles =180