Cuboid box

Cuboid box have dimensions of 30 cm, 25 cm and 40 cm. Sketch its network and compute surface area of box.

Result

S =  5900 cm2

Solution:

$a = 30 \ cm \ \\ b = 25 \ cm \ \\ c = 40 \ cm \ \\ \ \\ S = 2 \cdot \ (a \cdot \ b+b \cdot \ c+a \cdot \ c) = 2 \cdot \ (30 \cdot \ 25+25 \cdot \ 40+30 \cdot \ 40) = 5900 = 5900 \ cm^2$

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Makes no sense still...

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