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154 = 22/7 x r²
7/22 x 154 = r²
7 x 7 = r²
49 = r²
7 = r²
diameter = r x 2
= 7 x 2
= 14
154 = 22/7 * r^2
r^2 = 154 * 7/22
r^2 = 49
r= √49
r= 7
Jadi diameter = 2 * r = 2*7 = 14 cm