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panjang : 5x
lebar : 3x
tinggi : 2x
volume = panjang X lebar X tinggi
810 = 5x X 3x X 2x
810 = 30x³
810/30 = x³
27 = x³
∛27 = x
3 = x
panjang = 5x lebar = 3x tinggi = 2x
= 5(3) = 3(3) = 2(3)
= 15 cm = 9 cm = 6 cm
luas permukaan = 2 ( pl + pt + lt )
= 2 ( 15x9 + 15x6 + 9x6 )
= 2 ( 135 + 90 + 54 )
= 2 ( 279 )
= 558 cm²