The length of the rectangle is 5 cm. What should be the width of this rectangle so that the perimeter of the rectangle is 18 cm?
Recall that the perimeter is the sum of all four sides of a rectangle, that is, the sum of two identical sides of the length and two identical sides of the width of a given figure.
First, let’s find out how many centimeters of the perimeter will be “occupied” by two sides of the length of the rectangle.
1) 5 cm + 5 cm = 10 cm.
Now let’s calculate how many centimeters of the perimeter the two sides of the width should occupy.
2) 18 cm – 10 cm = 8 cm.
Therefore, one side must be equal to:
3) 8 cm / 2 sides = 4 cm.
Bottom line: the width should be 4 cm.
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