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2r = 37.68cm
22/7 x 2r = 37.68 cm
2r = 37.68 : 22/7
= 11.9...cm
= 12 cm
r=12 : 2 = 6cm
37,68 = 2 x 22/7 x r
37,68 = 44/7 x r
37.68 = 6.286 x r
37,68 / 6,286 = r
5.994 = r
thanks, semoga membantu