Question

Tolong dibantu ya no. 2

Answer 1

∠AED=∠AEB+∠BEC+∠CED
90°=20° + ∠BEC + 35°
90°= ∠BEC + 55°
90°- 55° = ∠BEC
35°= ∠BEC
∠BEC = 35°

Answer 2

No. 2 itu sudut siku2 = 90° (∠AED)

∠AED = ∠BEC - (∠AEB + ∠DEC)
90°     = ∠BEC - (20° + 35°)
90°     = ∠BEC - (55°)
∠BEC = 90°- 55°
∠BEC = 35°