**1. What is the perimeter of a rhombus?**

The perimeter of a rhombus is four times the length of its side. (A rhombus has four equal sides.)

**2. Which units are used to measure perimeters?**

The units for the perimeter of a shape are the same as the unit for the sides of the shape. i.e. Units of length

**3. What has to be done if one measurement is in one unit and the other in a different unit?**

Before adding the lengths, both measurements must be in the same units.

e.g. If the length of a rectangle is given as 3m and the width as 75 cm, one way would be to change 3m into 300 cm.

Then the perimeter can be found by calculating 2 x 300 + 2 x 75 which equals 750 cm which is equivalent to 7.5 metres.