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1. If the length of the side of a cube is doubled, how much per cent will its totalsurface area increase?(1) 400 (2) 300 (3) 200 (4) 100 |
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Answer» Let side of cube is sSurface area of cube A= 6*s*s If side of cube is doubled then s1 = 2sThen surface area of cube A1= 6(2s)*(2s) = 24*s*sChange in Surface Area %= ((A1-A) /A)*100= ((24*s*s - 6*s*s)/6*s*s)*100= (18/6)*100= 300% l am children please explain like what is meaning of s in this ans what is meaning of the s s is length of side of cube |
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