1. If the length of the side ofa cube is doubled, how much per cent wi

1.	1. If the length of the side ofa cube is doubled, how much per cent will its total1 (2surface area increase?(1) 400 (2) 300 (3) 200 (4) 100the sun) of their radii are
Answer» Let side=aTotal surface area=6a^2 Now, side=2aTotal surface area=6(2a)^2=24a^2 Percentage increase=(24a^2-6a^2)*100/6a^2=300% Option 2 is correct

1. If the length of the side ofa cube is doubled, how much per cent will its total1 (2surface area increase?(1) 400 (2) 300 (3) 200 (4) 100the sun) of their radii are

Answer»

Let side=aTotal surface area=6a^2

Now, side=2aTotal surface area=6(2a)^2=24a^2

Percentage increase=(24a^2-6a^2)*100/6a^2=300%

Option 2 is correct