Question

The base of a rectangular prism measures $30cm\times 40cm$ and has a height of $3\text{meters}$. What will the total surface area of the prism be?

• A. $44sqm$
• B. $444sqm$
• C. $4.44sqm$
• D. $44.4sqm$

Answer 1

The correct option is C $4.44sqm$

Given, the height of the prism is $3m$ and the base measures $30cm\times 40cm$.

We know that $100cm=1m$

$\Rightarrow 1cm=\frac{1}{100}m$

$\Rightarrow 30cm=\frac{30}{100}m=0.3m$

Similarly,

$\Rightarrow 40cm=\frac{40}{100}m=0.4m$
Now, total surface area of the prism
$=\text{area of rectangular face}(A+B+C+D+E+F)$

$=3\times 0.3+3\times 0.3+3\times 0.4+3\times 0.4+0.4\times 0.3+0.4\times 0.3$

$=4.44sqm$