The area of the rectangle is 1600 cm2, and one of the sides is 40 cm. Nadi its other side and perimeter.

The area of the rectangle is 1600 cm2, and one of the sides is 40 cm. Nadi its other side and perimeter. What is the name of such a rectangle?

We have a rectangle in which one of the sides is a = 40 cm, and its area is S = 1600 cm ^ 2.

To find its second side (b), it is necessary to divide the area by the known side:

b = S: a.

Then

b = 1600: 40;

b = 40 cm.

We get that b = a = 40 cm.

A rectangle with all four sides equal is called a square.

The perimeter of a square (P) is equal to the sum of the lengths of all its four sides:

P = a + a + a + a = 4a;

P = 4 * 40 = 160 cm.

Answer: b = 40 cm; P = 160 cm; the given rectangle is a square.