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Teach parts of a circle in Year 6 with a ready-to-use, interactive KS2 maths lesson. Across 30 sequenced slides, pupils identify the radius, diameter and circumference, explore the relationship between radius and diameter, and apply their understanding to progressively more challenging problems.
With instant feedback and automatic marking built in, this digital resource is ideal for whole-class teaching, independent practice, revision, intervention and home learning.
This Year 6 circles lesson takes pupils from recognising the basic features of a circle to using the relationship between radius and diameter in calculations and reasoning problems.
Pupils begin by learning the meaning of centre, radius, diameter and circumference. They then identify these features on diagrams, complete mathematical statements and establish that the diameter is twice the radius.
Further activities develop fluency in using:
The lesson progresses to questions involving decimal measurements, unit conversions, fractions and everyday circular objects. More demanding reasoning problems help pupils explain relationships, select the correct operation and apply their understanding in unfamiliar contexts.
Because answers are checked automatically, pupils receive immediate feedback while teachers save valuable marking time.
By the end of the lesson, pupils should be able to:
England National Curriculum for Mathematics
The statutory requirement states that pupils should:
“illustrate and name parts of circles, including radius, diameter and circumference and know that the diameter is twice the radius.”
The non-statutory guidance also suggests expressing the relationship algebraically, for example:
d=2×rd = 2 \times r
| National Curriculum requirement | How this lesson addresses it |
|---|---|
| Illustrate parts of circles | Pupils examine, label and complete circle diagrams. |
| Name the radius | Pupils identify radii and apply the definition to different diagrams. |
| Name the diameter | Pupils identify diameters and distinguish them from other lines. |
| Name the circumference | Pupils learn that circumference means the distance around a circle. |
| Know that the diameter is twice the radius | Pupils complete calculations, statements and true-or-false questions using this relationship. |
| Express the relationship mathematically | Activities reinforce d=2rd = 2r and r=d÷2r = d \div 2. |
| Develop fluency | Pupils complete repeated radius-and-diameter calculations with varied measurements. |
| Reason mathematically | Pupils assess claims, select formulas and explain circle relationships. |
| Solve problems | Multi-step questions use fractions, conversions, money and real-life circular objects. |
The statutory Year 6 vocabulary is radius, diameter and circumference. This lesson also uses the centre to help pupils understand and identify each part accurately.
Yes. It directly covers the Year 6 requirement to illustrate and name the radius, diameter and circumference and know that the diameter is twice the radius.
Yes. The lesson teaches pupils that d=2rd = 2r and that the radius is half the diameter, r=d÷2r = d \div 2.
Begin with clear diagrams and definitions before asking pupils to identify each part. This lesson then introduces the radius–diameter relationship and develops it through calculations, unit conversions and reasoning problems.
No. This is a digital interactive lesson, rather than a printable worksheet pack. Pupils complete the activities on screen and receive immediate feedback.
This resource is digital only. It is designed to run in a web browser and is best used on a computer, laptop or tablet.
Answers are built into the interactive lesson. Activities are marked automatically, and pupils can see feedback and review their responses. A separate printable answer-key document is not included.
No. In line with the Year 6 curriculum, pupils identify and name the circumference as the distance around a circle. Calculating circumference using π is later curriculum content.
It is designed for children aged 10–11 in UK Year 6. It may also support Year 7 catch-up, intervention or revision.
Yes. Display it on an interactive whiteboard for whole-class instruction or allow pupils to complete it independently on computers or tablets.
Calculating Angles in Quadrilaterals
Save planning and marking time with a complete interactive lesson that moves pupils from circle vocabulary to confident radius-and-diameter problem solving.
Add the lesson to your basket for instant access, or choose Skoolmaths membership to unlock this and every other resource.
Designed for ages 10–11 (UK Year 6). Aligned to the UK National Curriculum; adaptable to US state standards.
| Year Group | Year 6 Maths |
|---|---|
| Resource Type | 🎓 Interactive Lesson & Activities |
| Format | Digital Only |
| Curriculum | England & Wales — KS2 (Years 3–6) |
| Added | 12 March 2020 |
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