tolong sya kerjakan ya pakai carannay

jumlah sudut segitiga adalah 180°

180° = 2x + x + 15° + 3x
180 ° = 6x + 15°
(180-15)° / 6 = x
x = 27,5°

sudut A :
= 2x
= 2 . 27,5°
= 55°

∠A +∠B + ∠C = 180°
2x + x + 15° + 3x = 180°
6x = 180 - 15
x = 165/6
x = 27,5°

∠A = 2x
∠A = 2(27,5)
∠A = 55°

Semoga membantu