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3/4 x phi r kuadrat
= 3/4 x 22/7 x 7 kuadrat
= 3/4 x 22/7 x 49
= 3/4 x 22 x 7
= 3/2 × 11 × 7
= 3/2 x 77
= 115,5cm
= 3/4 × 154
= 115.5