7. If each edge of a cube is doubled,
(1) how many times will its surface area increase?
(ü) how many times will its volume increase?
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Surface area of cube=6a2
Is sides of cube is doubled
New surface area is =6×4a2
Divide 2 by 1
=24a2surfaceareaofcube1surfaceareaofcube2=6a224a2=4times
Surface area increased four times
Volume of cube= a3
Volume of new cube= (2a)3
=8a3
Divide 2 by 1
volumeofcubevolumeofnewcube=a38a3
Volume increased 8 times
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