pada gambar disamping besar

jumlah sudut segitiga = 180°
2x + 7x + 3x = 180°
12x = 180°
x = 180/12
x = 15°

sudut p = 2x = 2×15° = 30°

jd sudut p = 30°

2x+7x+3x=180°
12x =180°
x. =180:12
x. =15
2x=30°