Cuboid has a surface of 516 cm2. Side a = 6 cm and b = 12 cm. How long is the side c =?

Correct answer:

c =  10.3333 cm

Step-by-step explanation:

a=6 cm b=12 cm S=516 cm2 S=2(ab+bc+ac) c=(S/2a b)/(b+a)=(516/26 12)/(12+6)=31310.3333=10.3333 cm S2=2 (a b+b c+a c)=2 (6 12+12 10.3333+6 10.3333)=516

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