Mathematics·Geometry·conceptual
Parts of a circle
Illustrate and name parts of circles, including radius, diameter, and circumference; know that the diameter is twice the radius
Suggested ages 10–11
Learning journey
Your child is developing advanced spatial skills — working with 3D shapes and nets, using coordinate grids with negative numbers, calculating angles, and understanding geometric transformations like reflection and translation.
Evidence of understanding
- Label the radius, diameter, and circumference on a circle diagram
- Calculate the diameter given a radius of 4.5 cm (diameter = 9 cm)
- Explain the relationship between radius and diameter in their own words
Assessment prompt
If you give Parts of a circle a round plate and a ruler, can they measure the diameter — and explain how the radius compares to the diameter?
Standards alignment
No external standards are linked to this topic.