Tentukan besar sudut-sudut dalam segitiga berikut!

Jumlah sudut segitiga = 180°

A + B + C = 180
7d + 3d + 2d = 180
12d = 180
d = 180 : 12
d = 15

sudut A = 7d = 7 × 15 = 105°
sudut B = 3d = 3 × 15 = 45°
sudut C = 2d = 2 × 15 = 30°

semoga membantu^^