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LpT kecil = 2la+ls
= (2πr²)+(2πrt)
= (2×22/7×0,35×0,35)+(2×22/7×0,35×5)
= 7,7+110
= 117,7 cm²
Lpt besar = 2la+ls
= (2πr²)+(2πrt)
= (2×22/7×7×7)+(2×22/7×7×5)
= 308+220
= 528 cm²
Lp bangun = (Lpt kecil+Lpt besar)-(2×22/7×0,35×0,35)
= (117,7+528)-7,7
= 645,7-7,7= 638 cm²
Jadi, jawabannya adalah c. 638 cm²
-- Lp1 = 2πr(r+t)= 2 x 22/7 x 3,5 (3,5 + 5)
= 22 (8,5)=187cm²
-- Lp2 = 2πr(r+t)= 2 x 22/7 x 7 (7+5)
= 44 (12) = 528
Lp keseluruhan = 187+528=715 cm²