Question

The difference of two actual angles in a right angled trangle is 2(pie)/5. The value of the smallest angle is?

Answer 1

in right angle triangle one angle is 90°
let another two angles are A and B
now,
A +B +90° =180°
A + B =90°
given,
A -B =2π/5 =2(180°)/5 =72°

solve both equation ,
A + B= 90°
A - B =72°

A =162/2 =81°
and B =9 °

hence, smallest angle is 9°

Answer 2

9% the smallest angle