keliling lingkaran = πd=3,14*10,5=32.970
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keliling lingkaran = πd=3,14*10,5=32.970
maka --->
K lingkaran = phi × d
K lingkaran = 22/7 × 10.5
K lingkaran = 22 × 1.5
K lingkaran = 33 dm
jafi keliling lingkarang dgn diameter 10.5 dm adalah 33 dm.