Question

http://prntscr.com/hp3eqj Please help me. I will labely your answer as the best.

Answer 1

Please help. Who is good at Math?

Answer 2

Acute angle is less than 90, Obtuse is anything more than 90 till a straight line or 180, right is always 90. Angle AFB is less than 90 so its an acute, while DFB is more than 90. So, therefore it's a Obtuse, and CFD is exactly a right angle, 90.