Edge c

Find the edge c of cuboid if an edge a = 20 mm, b = 30 mm and surface area S = 8000 mm2.

Correct result:

c =  68 mm


a=20 mm b=30 mm S=8000 mm2  S=2(ab+bc+ca)  c=(S/2a b)/(a+b)=(8000/220 30)/(20+30)=68 mm

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