Tlg bantu nomer 20-23 kak

NO 21

∠ FEB =180 - 130 = 50°
∠ FBE = 180 - 50 - 75 = 55° (B)

No. 20
∠ABC = ∠APQ = 52°
∠ACB = ∠AQP = 34° = 2x
x = 34/2
x = 17°
∠ABC + ∠BPQ = 180°
52° + y = 180°
y = 180° - 52° = 128°