 Perimeter I

Lesson

What is perimeter?

The perimeter is the distance around the outside of a shape. If we imagine our shape being made up of unit squares, we can use those to count the distance around the outside of the whole shape. We count the edge of every unit square, making sure we include the whole outside of our shape.

Let's take a look.

Remember!

We count the edge of every unit square, around the outside of our shape.

Worked Examples

Question 1

Find the perimeter of the shaded region shown, where each square has a length of $1$1 unit. 1. $\editable{}$ units

Question 2

Find the perimeter of the shaded region shown, where each square has a length of $1$1 unit. 1. $\editable{}$ units

Question 3

Find the perimeter of the shaded region shown, where edges are 1 unit in length each. 1. $\editable{}$ units

Outcomes

5.M1.04

Estimate and measure the perimeter and area of regular and irregular polygons, using a variety of tools (e.g., grid paper, geoboard, dynamic geometry software) and strategies