Question

# Question 7(i) If each edge of a cube is doubled How many times will its surface area increase?

Solution

## Let the edge of cube be l Since, Surface are of the cube (A) = 6l2 When edge of cube is doubled, then Surface are of the cube (A′)=6(2l)2=6×4l2=4×6l2 A′=4×A increase = A' - A Hence surface area will increase 3 times

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