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= 4 x Phi x r kuadrat
= 4 x 3,14 x 10,5 x 10,5
= 1.384,74 cm persegi
Semoga membantu :))
= 22/7 x 21 x 21
= 22 x (3x21)
= 22 x 63
= 1386 cm²
maaf klo salah