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Understand the Relationship Between Different Parts of a Circle

In this worksheet, students will be asked to find parts of a circle - the diameter, radius and circumference.

'Understand the Relationship Between Different Parts of a Circle' worksheet

Key stage:  KS 2

Year:  Year 6 Maths worksheets

Curriculum topic:   Geometry: Properties of Shapes

Curriculum subtopic:   Know Circle Parts

Difficulty level:  

Worksheet Overview

In this activity, you will asked to complete different questions all about circles.


A circle is a 2D shape where every point on a circle has the same fixed distance from the centre.


In Year 6, we learn about the parts of a circle.


Let's recap:



This circle shows the diameter. This is the length of the line through the centre, from one edge to the other.


Circle showing diameter



This circle shows the radius. The radius is the distance from the centre of the circle to the outer edge.

The radius is half of the diameter so is fairly straightforward to calculate.


Circle showing radius




A circle's circumference is the distance around the edge.


Circle showing circumference




If a circle's diameter is 12 cm, what is its radius?



The diameter is double the size of the radius, so the radius is half the size of the diameter!

12 ÷ 2 = 6

The radius is 6 cm.


Remember that the diameter is double the radius, so we would need to halve the diameter to get the radius


Are you ready to have a go at some questions about circles?


girl thinking

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