One leg of a right triangle is 4 feet long

Question

One leg of a right triangle is 4 feet long, and the angle next to it pi/5 radians. Find the length of the other leg and the hypotenuse.

Answer 1

other angle=π/2-π/5=3π/10

sin(3π/10)/4=sin(π/5)/x

x=2.91

Y=√2.91²+4²= 4.944