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264 = 2 x 22/7 x r
264 : 2 = 22/7 x r
132 = 22/7 x r
132 : 22/7 = r
132 x 7/22 = r
42 = r
maka jari2 = r = 42 cm
264 = 22/7 . d
264 . 7 = d
22
12.7 = d
84 = d
r = 84/2
= 42 cm