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sisi=√8²+6²=√64+36=√100=10
Lalas=d1.d2/2=16.12/2=96 cm²
Kalas=4s=4.10=40 cm
Lpermukaan=2×Lalas+Kalas×tprisma
672=2×96+40×t
672=192+40t
40t=672-192
40t=480
t=480/40
t=12 cm