Calculate 81936

The volume of the block is 7,500 dm3. The lengths of the edges are in the ratio 3: 4: 5. Calculate the surface area of the cuboid.

Correct answer:

S =  2350 cm2

Step-by-step explanation:

a:b:c=3:4:5=3x:4x:5x a = 3x b = 4x c = 5x  V=7500 cm3 V = abc = 3 4 5 x3  x=3V/(3 4 5)=37500/(3 4 5)=5 cm  a=3 x=3 5=15 cm b=4 x=4 5=20 cm c=5 x=5 5=25 cm  S=2 (a b+b c+c a)=2 (15 20+20 25+25 15)=2350 cm2



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