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L =
154 = 22/7 x r²
154 x 7/22 = r²
49 = r²
r = √49
r = 7
Luas seluruh permukaan:
Lp = 2 x
Lp = 2 x 22/7 x 7² + 2 x 22/7 x 7 x 30
Lp = 308 + 1320
Lp = 1628 cm²
Salam ^^