The area of a rectangle is 136 cm2. What is its perimeter if its width is 8 cm?

1. To find the perimeter of a rectangle, you need to know the length and width. In our case, only the width of 8 cm is known. We can find the length from the area.

2. Recall the area formula:

S = a * b, where a and b are the sides of the rectangle.

3. Substitute the known values into the formula, we get the equation. Let’s solve it and find the second side of the rectangle:

S = a * b;

136 = 8 * in;

h = 136: 8;

h = 17 (cm) – the length of the rectangle.

4. Put the obtained values into the formula for finding the perimeter:

P = 2 * (a + b) = 2 * (8 + 17) = 2 * 25 = 50 (cm).

Answer: 50 cm.