The area of the rectangle is 7 3/4 cm2. Find the perimeter of this rectangle if it is 2.5 cm wide.

First, we convert the known value of the area of the rectangle into a decimal fraction.

7 3/4 = 7.75 cm2

We find how many centimeters is the length of the figure.

We divide the indicated area by the known width.

7.75 / 2.5 = 3.1 cm.

To find out the perimeter of a rectangle, you need to add the value of all the lengths of the sides of the shape.

Thus, we get:

2.5 + 3.1 + 2.5 + 3.1 = 5 + 6.2 = 11.2 cm.

Or:

2 * (2.5 + 3.1) = 2 * 5.6 = 11.2 cm.

Answer: 11.2 cm.