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30/60 = juring QOR/ 20
1/2 = juring QOR/20
(1/2) : 20 = juring QOR
40 = juring QOR
Dit : Luas juring QOR ... ?
Jwb :
( Cari dulu L.O )
POQ = Sudut pusat/sudut 1 putran × L.O
20 cm2 = 60°/360° × L.O
20 cm 2 = 1/6 × L.O
L.O = 20cm2 x 6/1
L.O = 120 cm2
Sekarang mencari QOR
QOR = sudut pusat/1putaran × L.O
QOR = 30°/360° × 120 cm2
QOR = 1/12 × 120 cm2
QOR = 10 cm2 (d)
Semoga membantu :)