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π = 22/7
r = 21 cm
P. Busur = α/360 × πd
22 = α/360 × 22/7 × 42
22/22 = α/360 × 6
1 = α/60
60 = α
Lj = α/360 × πr²
= 60/360 × 22/7 × 21 × 21
= 1/6 × 22 × 3 × 21
= 11 × 21
= 231 cm²
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