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132 = 2 x 22/7 x r
r = 132x7/2x22
r = 21
K = 132 cm
Maka,
K = 2 x x r
132 = 2 x 22/7 x r
132 = 44/7 x r
r = 132 : 44/7
r = 132 x 7/44
r = 21 cm
(JAWABAN D)