bantuan dong... hehe

a) x
9x = 5x + 60°
9x - 5x = 60°
4x = 60°
x = 60° : 4
x = 15°

b) Sudut ABD
9x = 9(15°) = 135°

c) Sudut HFA
5x + 60° = 5(15°) + 60° = 75° + 60° = 135°