The width of the rectangle is 3.7 cm, and the length is 8.4 cm longer than the width. find the perimeter.

The opposite sides of a rectangle are equal, their sum is calculated by the formula:

P = 2a + 2b. Let’s find this value for such a figure, the width of which is 3.7 cm, and the length is 8.4 cm longer. Substitute the known values into the formula and write the expression for determining the perimeter:

P = 2 * (3.7 + 8.4) + 2 * 3.7.

According to the order of performing mathematical operations, first of all we find the values in brackets, then multiplication and division, and only then addition and subtraction, all actions in order – from left to right.

P = 24.2 + 7.4 = 31.6 cm.