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.

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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.

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Question 2

Find the perimeter of the shaded region shown, where each square has a length of $1$1 unit.

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Question 3

Find the perimeter of the shaded region shown, where edges are 1 unit in length each.

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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

Perimeter I

What is perimeter?