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154 = 2*22/7*r
154 = 44/7 r
154 x 7 = 44r
r = 1078 / 44
r = 24.5
d = 2r = 2x24.5 = 49
154=22/7 × d
d = 7/22 ×154
d = 49
jadi diameternya 49cm