You can
put this solution on YOUR website!
You just need to learn what the word "bisect" means. It means to
divide into two equal parts. If you know what that means then you'll
know that a bisector must divide 36° into two equal parts, so that
will make each one of them be 18°. So if one can construct an angle of
36°, one can use the angle bisector construction to construct an angle
of 18°..
Edwin