Find the width of a rectangular glass sheet if its perimeter is 10 decimeters and the length is 4 decimeters.

At its core, the perimeter is twice the sum of the sides of the rectangle, so before you can find the width of the glass, you need to determine the sum of the sides.

Divide the known perimeter by 2.

We get:

10/2 = 5 dm.

Find the width of the glass sheet.

To do this, subtract the length of the glass from the sum of the sides of the sheet.

We get:

5 – 4 = 1 dm.

Answer:

The width of the glass is 1 dm.