Question

If the edge of a cube is trebled ,what will be the change in the surface area

Answer 1

According to given sum,

let the side of cube be a . so surface area of cube is

$tsa = 6 {a}^{2}$
side is trippled . so the new edge is 3a.

new surface area is

$= > \: 6 ({3a})^{2}$
$= > 6 \times 9 {a}^{2}$
$= > 9 \times (6 {a}^{2} )$
$= > 9 \times tsa$

Hence , if edge is trippled. then the surface area will become 9 times.

:-)Hope it helps u.