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Perimeter of composite rectilinear shapes

Perimeter of composite rectilinear shapes

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Tutor: Alisha

Summary

Perimeter of composite rectilinear shapes

In a nutshell

A composite rectilinear shape is a shape that is made of squares and rectangles put together. The perimeter of a composite shape can be found by adding up all the lengths of the sides of the shape. In order to find the side lengths of the composite shape, you may have to consider the size and side lengths of the individual squares or rectangles that make up the composite shape.



Calculating the perimeter for composite rectilinear shapes

procedure

1
Find the length of all the sides of the individual squares or rectangles that make up the composite shape.
2
Use these lengths to find all the lengths in the composite shape.
3
Find the perimeter by adding up all the side lengths.


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Example 1

Find the perimeter of the shape.

Maths; Measurement; KS2 Year 5; Perimeter of composite rectilinear shapes


The shape is made up of a square and a rectangle joined together. The square has side length 3cm3cm3cm, and the rectangle has length 3cm3cm3cm and width 2cm2cm2cm. Use these lengths to label the diagram with the side lengths of the composite shape.

Maths; Measurement; KS2 Year 5; Perimeter of composite rectilinear shapes


Find the perimeter by adding up all the side lengths.

Perimeter=3+3+3+2+2+3+2+2=20cm‾Perimeter = 3 +3+3+2+2+3+2+2=\underline{20cm}Perimeter=3+3+3+2+2+3+2+2=20cm​​​


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Basics

Perimeter of rectilinear shapes
Perimeter of rectilinear shapes

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    Overview

    FAQs - Frequently Asked Questions

    How do you work out the perimeter of a composite shape?

    The perimeter of a composite shape can be worked out by considering side lengths of the individual shapes that it is made up from. Use the side lengths of the individual squares and rectangles to find the side lengths of the composite shape. Then add up all sides to find the perimeter.

    How do you work out the perimeter?

    The perimeter is calculated by adding up all the lengths of sides of a shape.

    What is the perimeter of a shape?

    The perimeter is the full distance measured around a 2D shape.

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