Cuboid box

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

Correct result:

S =  5900 cm2


a=30 cm b=25 cm c=40 cm  S=2 (a b+b c+a c)=2 (30 25+25 40+30 40)=5900 cm2

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Makes no sense still...


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