Perimeter

The perimeter of a shape is the whole distance round its edge: add up the lengths of all its sides. For a rectangle, add the length and the width and double it. It is a length, so it is measured in cm or m.

Depth 1 · Foundation

You can find the perimeter of any shape with straight sides by adding its sides, and use the short cut for rectangles and squares.

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Depths of understanding

1
Foundation
You can find the perimeter of any shape with straight sides by adding its sides, and use the short cut for rectangles and squares.
Read it
- Perimeter: The Way RoundGeometry Level 1: Shapes and Space
Opens after
PolygonsA perimeter is found by going round a polygon's sides, one after another.LengthA perimeter is a length, measured in centimetres or metres.AdditionThe perimeter is the lengths of all the sides added up.
2
Deeper
You know perimeter and area are different measures: the same fence can close off different areas, the same area can have different perimeters, and the squarest rectangle holds the most.
Read it
- Same Fence, Different FieldsGeometry Level 1: Shapes and Space
Master depth 1 first
Area, depth 2Comparing perimeter with area needs the area of a rectangle: length times width.

Your path here

What's still between you and Perimeter, depth 1, in the order you can learn it.

Where it fits

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Polygons LengthMeasurement AdditionArithmetic

This concept

PerimeterGeometry

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Builds onThis conceptOpens upPolygons LengthMeasurement AdditionArithmetic PerimeterGeometry Pi (π)