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kell= 2 Phi r = 2 x 22/7 x 7= 44 cm
luas= Phi r^2 = 22/7 x 7^2= 154 cm^2
untuk r=21cm
kell= 2 x 22/7 x 21= 132 cm
luas= 22/7 x 21^2= 1386 cm^2