How do you find the hypotenuse of an obtuse triangle with only the angle and one leg given?

An obtuse triangle is a triangle in which one of the angles is an obtuse angle. (Obviously, only a single angle in a triangle can be obtuse or it wouldn't be a triangle.) A triangle must be either obtuse, acute, or right.

An obtuse triangle can be dissected into no fewer than seven acute triangles

I saw this in my brothers math book. Hope this helps 

f is the midpoint of