## Perimeter

### The perimeter of a shape is the total length of all the sides of the shape

The perimeter of a shape is the total length of all the sides of the shape. It is a measure of how long the boundary of the shape is.

To calculate the perimeter, you typically add up the lengths of all the sides of the shape. The unit of measurement for the perimeter will depend on the units used to measure the sides.

For example, if you have a rectangle with sides of length 5 units and 8 units, the perimeter would be calculated as follows:

Perimeter = 2 × (length + width)

Perimeter = 2 × (5 + 8)

Perimeter = 2 × 13

Perimeter = 26 units

Similarly, for a triangle with sides of length 3 units, 4 units, and 5 units, the perimeter would be calculated as follows:

Perimeter = side1 + side2 + side3

Perimeter = 3 + 4 + 5

Perimeter = 12 units

In summary, the perimeter of a shape is the total length of all its sides, and it is commonly calculated by adding up the lengths of the sides.

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