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lp = 2(pl+pt+lt)
= 2 (16.15+16.14+15.14)
= 2 (240+224+210)
= 2 (674)
= 1348cm²
balok kedua
lp = 2 (pl+pt+lt)
= 2(18.17+18.14+17.14)
= 2 (306+252+238)
= 2(796)
= 1592cm²
aku gatau yang b. maaf ya