The length of the rectangle is 40 meters and the area is 400 m2. how much will be the width and perimeter.

To find the perimeter of a rectangle, let’s remember the formula:

P = 2 (a + b);

That is, in order to find the perimeter, we need to know the length and width of the rectangle.

Let’s see what we know from the condition. We know that the length of the rectangle is 40 m and the area is 400 m2.

In order to find the width of the rectangle, we will express it from the area formula.

S = a * b;

b = S / a;

Substitute and calculate:

b = 400/40 = 10 meters width of the rectangle.

We are looking for a perimeter:

P = 2 (a + b) = 2 (40 + 10) = 2 * 50 = 100 meters.