Question

If the area of a rectangle of length = 3 m and width = 7 m is $\text{21}{m}^2,$ then what is the volume of a rectangular block having length = 3 m, width = 7 m and height = 1 m?

• A. $\text{31}{m}^3$
• B. $\text{21}{m}^3$
• C. $\text{23}{m}^3$
• D. $\text{22}{m}^3$

Answer 1

The correct option is B

$\text{21}{m}^3$

Since the length and width of both the rectangle and the rectangular block are the same, we can get the volume by multiplying area with height.

Volume $\text{(V) = area}\times \text{height}$

Volume $\text{(V) = 21}\times 1=21m^3$