The side of the square is 6cm. Find the width of a rectangle with the same perimeter and a length of 3cm.

The perimeter is the sum of the lengths of the sides of a geometric figure.

Let’s calculate the perimeter of the square:

4 * 6 = 24 (cm).

The perimeter of a rectangle is twice the sum of the length and width of that rectangle. Let us denote the width of the rectangle by a. Let’s compose and solve the equation:

2 (a + 3) = 24;

a + 3 = 12;

a = 9 (cm).

Answer: the width of the rectangle is 9 cm.