Chapter E, Problem 12.2EX

To determine

To find the total surface area of the rectangular solid.

Answer to Problem 12.2EX

Option (b)

Explanation of Solution

Given information: The rectangular solid with dimensions 12, 9 and 6 units.

Concept used:

  $\begin{array}{l}\text{Total surface area of}\text{the}\text{rectangular}\text{solid}=2(lb+bh+hl)\\ \\ \text{where,}l=\text{length;}b\text{=}\text{breadth;}h\text{=}\text{height}\end{array}$

According to the situation,

  $\begin{array}{l}\text{Total surface area of}\text{the}\text{rectangular}\text{solid}=2(lb+bh+hl)\\ =2(108+54+72)=468\\ \end{array}$

Hence, the total surface area of the rectangular solid is 468 square units .