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K. lingkaran = 2πr
= 2 x 3,14 x 5
= 31,4cm
b. r=42/2 = 21 cm
k. lingkaran = 2πr
= 2 x 22/7 x 21
= 132cm
2. a. K. lingkaran = 2πr
22 = 2 x 3,14 x r
22 = 6,28 x r
r = 22/6,28 = 3,5cm
b. K. lingkaran = 2πr
210 = 2 x 3,14 x r
210 = 6,28 x r
r = 210/6,28 = 33,4