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14 : 2 = 7
luas = phi x r x r
22/7 x 7 x 7
22 x 1 x 7
= 154 cm^2
l = 22/7 x 7²
l = 22/7 x 49
l = 22 x 7
l = 154 cm²
Jawabannya : C. 154