Question

13. The square of sum of all the three sides of
cuboid is equal to the sum of total surface
area and ......​

Answer 1

The square of sum of all the three sides of

cuboid is equal to the sum of total surface

area and

$\underline {\pink { Sum \:of \:the \: squares \:of \:each \:side }}$

Explanation :

If l, b and h are three sides of. cuboid .

/* According to the problem given */

( l + b + h) ²

= l² + b² + h² + 2lb + 2bh + 2lh

= (l² + b² + h² )+ 2(lb + bh + lh)

= ( sum of the squares of each side ) + TSA

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