Edge c

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

Correct answer:

c =  68 mm

Step-by-step explanation:

a=20 mm b=30 mm S=8000 mm2  S = 2(ab+bc+ca)  c=a+bS/2a b=20+308000/220 30=68 mm



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