Question

The perimeter of a rectangle is 20 cm. The width of the rectangle is 4 cm. What is the area of the rectangle?

Answer 1

The area is `24 cm^2`

Explanation:

Let `a` and `b` be the sides of the rectangle.

The width `a` is `4 cm`,
If perimeter is `20cm` then we can write `2a+2b=20`

`a+b=10`

`4+b=10`

`b=6`

Now we can calculate the area: `A=a*b=4*6=24`

Answer: Area of this rectangle is `24 cm^2`