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La = 112 cm²
p = 14 cm
t = 5 cm
Dit : L balok
Jawab :
lebar?
La = p . l
112 = 14 . l
l = 112/14
l = 8 cm
L = 2 (pl + pt + lt)
L = 2 (14.8 + 14.5 + 8.5)
L = 2 (112 + 70 + 40)
L = 444 cm²
L permukaan balok
2x (pxl) + (pxt) + (lxt)
2x (14x8) + (14x5) + (8x5)
2x112 + 70 + 40
2x 222
444cm²
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