p.busur PQ = 66 cm
<POQ° = a° = 108°
π = 22/7
2πr x a°/360° = p.busur
2 x 22/7 x r x 108°/360° = 66
r = 66 x 7/22 x 360/108 ÷ 2
r = 35 cm
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p.busur PQ = 66 cm
<POQ° = a° = 108°
π = 22/7
2πr x a°/360° = p.busur
2 x 22/7 x r x 108°/360° = 66
r = 66 x 7/22 x 360/108 ÷ 2
r = 35 cm