Cuboid - edges

The cuboid has dimensions in ratio 4: 3: 5, the shortest edge is 12 cm long. Find:
(A) the lengths of the remaining edges,
(B) the surface of the cuboid,
(C) the volume of the cuboid

Correct result:

a =  16 cm
c =  20 cm
S =  1504 cm²
V =  3840 cm³

Solution:

$$\begin{gathered} b=12 \\ k=b\mathrm{/}3=12\mathrm{/}3=4 \\ a=4\cdot k=4\cdot 4=16\text{ cm} \end{gathered}$$

$c=5\cdot k=5\cdot 4=20\text{ cm}$

$S=2\cdot (a\cdot b+b\cdot c+a\cdot c)=2\cdot (16\cdot 12+12\cdot 20+16\cdot 20)=1504{\text{cm}}^2$

$V=a\cdot b\cdot c=16\cdot 12\cdot 20=3840{\text{cm}}^3$

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