Question

One side of a rectangle is $7$ meters long and its area is $21$ square meters. What will its perimeter be?

• A. $10m$
• B. $56m$
• C. $20m$
• D. $42m$

Answer 1

The correct option is B $56m$

Area $=21sqm$
Area = length $\times$ width
$21=7\times$ width
So, we need to find the number which when multiplied by $7$, gives $21.$
Since$7\times 3=21,$ we can say that the width of the rectangle is $3m.$
Let’s draw this rectangle.

Perimeter of the rectangle $=7+3+7+3=20m$