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r1 = 3cm
r2 = 5cm
dit: perbandingan Keliling...?
K = 2 π r
,
K1/K2 = 2πr1/2πr2
K1/K2 = r1/r2
K1/K2 = 3/5
perbandingan K1 dan K2 = 3 : 5