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kalau 10cm adalah jari jari
= luas = 1/2 phi r^2
= 1/2 3.14 10^2
= 1/2 314
= 157
kalau 10cm adalah diameter. r berarti 5 ya
= luas = 1/2 phi 5^2
= 1/2 3.14 25
= 39.25
ok ??