Skill: Find perimeter of polygons

The perimeter is the total distance around a closed shape. To find it:

1. Identify every side of the polygon.
2. Make sure all side lengths use the same unit.
3. Add the lengths of all the sides.
4. Write the answer in linear units, such as centimeters or meters.

Example: Find the perimeter of this pentagon. Its side lengths are $(6\text{ cm})$, $(4\text{ cm})$, $(5\text{ cm})$, $(3\text{ cm})$, and $(7\text{ cm})$.

Add every side:

$$6+4+5+3+7=25$$

Therefore, the perimeter is:

$$\boxed{25\text{ cm}}$$

Remember, perimeter measures the distance around a shape, so the answer uses units like centimeters—not square centimeters, which are used for area.