Question

find x and y. I can't figure it out

Answer 1

We know, that angle made up at semi-circle is 90°.
Now,
40°+X+90°=180°
130°+X=180°
x=180°-130°
x=50°

x+y=180° (co-interior angle)
50°+y=180°
y=180°-50°
y=130°