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r = √L ÷ π
r = √154 ÷ 22/7 = 7cm
K = 2πr
K = 2 × 22/7 × 7 = 44cm
Mohon maaf banget kalau salah
2.phi.r
2.22/7.7
44 cm
Maaf apabila ada yang tidak dimengerti dan ada yang salah