Tolong dibantu ya.....
Jawab:
lingkaran
sudut keliling = 1/2 x sudut pusat
gambar 1
<AOB = x = 70
y = 1/2 x = 35
gambar 2
<AOC= 2 x < ABC
3x = 2 x 60
3x = 120
x= 40
gambar 3
<PRO = 15
<QPR= 50
a. <QOR = 2 x <QPR
<QOR = 2 x 50 = 100
b. < OQR = 1/2 (180 - <QOR)
<OQR = 1/2 (180 - 100) = 1/2 (80)
<OQR = 40
c. <PQR = 180 - <QPR - < PRQ
= 180 - 50 - (15 + 40)
= 180 - 50 - 55
= 75
