tentukan keliling dan luas lingkaran yg berdiameter 7m
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Penyelesaian:
d=7m
r=3,5m
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K=Πd
K=22/7×7
K=22m
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L=Πr²
L=22/7×3,5×3,5
L=22×0,5×3,5
L=11×3,5
L=38,5m²
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