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kliling lingkaran = 22
2 x 22/7 x r = 22
44/7r = 22
r = 22 x 7/44
r = 7/2
r = 3,5
jari-jari = 3,5 cm
K = 2πr
22 = 2 × 22/7 × r
22 × 7 = 2 × 22 × r
154 = 44 r
154 ÷ 44 = r
3,5 = r
jadi, r (jari-jarinya) = 3,5 cm