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= 22/7.7.7 + 22/7.7.11
= 154 + 242
= 396 dm²
b.) Lp = πr² + π.r.s
= 3,14 x 7,5 x 7,5 + 3,14 x 7,5 x 20
= 176,625 + 471
= 647,625 cm²
c.) Lp = πr² + π.r.s
= (samakan satuannya)
= 3,14 x 8,5 x 8,5 + 3,14 x 8,5 x 16
= 226,865 + 427,04
= 653,905 cm²