tolong jawab tiga pertanyaan di atas pakai jalan

jumlah sudut segitiga = 180°
10) 180° - 30° = 150°
150° / 2 = 75°
11 ) sudut Q = sudut P = 37,5°
sudut R = 180° - 2(37,5)°
= 180° - 75°
= 105°

13) sudut PSQ = SPQ = 50°
= PQS = 180° - 2(50)
= 180°-100°
=80°
sudut QSR = 180°- sudut PSQ
= 180°-50°
=130°
sudut SQR = sudut SRQ = 180°-130° / 2
=50/2 = 25
PQR = PQS + SQR
=80+25 = 105