Mencari sudut AOB
x/360° × π × r × r = 231 cm²
x/360° × 22/7 × 21 × 21 = 231
231x/ 60 = 231
x = 60°
Busur AB
=60°/ 360° × π × d
= 1/6 × 22/7 × 42
= 22 cm
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Mencari sudut AOB
x/360° × π × r × r = 231 cm²
x/360° × 22/7 × 21 × 21 = 231
231x/ 60 = 231
x = 60°
Busur AB
=60°/ 360° × π × d
= 1/6 × 22/7 × 42
= 22 cm