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= 2πr
= 2 x 22/7 x 7
= 44 cm
kel lingkaran (r = 10,5)
=2πr
=2 x 22/7 x 10,5
= 66cm
= 2×22/7×7
= 308 / 7
= 44 cm
2×22/7×10,5
=462 / 7
=66 cm