NumihanaA circle has radius 5 cm. What is its diameter, in cm?
Answer: ________________
LEARN, PRINT & PRACTISE
Radius and diameter.
Radius and diameter
Numihana · England Year 6
Radius and diameter
Practice sheet
Name: ______________
Date: ______________
Radius and diameter
A circle has radius 10 cm. What is its diameter, in cm?
Answer: ________________
A circle has radius 8 cm. What is its diameter, in cm?
Answer: ________________
A circle has radius 5 cm. What is its diameter, in cm?
Answer: ________________
A circle has radius 19 cm. What is its diameter, in cm?
Answer: ________________
A circle has radius 11 cm. What is its diameter, in cm?
Answer: ________________
Numihana · England Year 6
Radius and diameter
Answer key
Name: ______________
Date: ______________
Radius and diameter
A circle has radius 5 cm. What is its diameter, in cm?
Answer: 10
A circle has radius 10 cm. What is its diameter, in cm?
Answer: 20
A circle has radius 8 cm. What is its diameter, in cm?
Answer: 16
A circle has radius 5 cm. What is its diameter, in cm?
Answer: 10
A circle has radius 19 cm. What is its diameter, in cm?
Answer: 38
A circle has radius 11 cm. What is its diameter, in cm?
Answer: 22
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The skill behind this activity
Radius and diameter
Department for Education: mathematics programmes of study ↗
Year 6 → Geometry → Properties of shapes · Selected statutory skill. Pack 2.2.0 · source checked 2026-10-12.
For teachers and parents
A radius joins the centre to the circumference. A diameter passes through the centre from one side to the other, so its length is twice the radius.
A common slip
A diameter must go through the centre; the circumference is the boundary rather than a straight line through it.
Worked example
A circle has radius 19 cm. What is its diameter, in cm?
Answer: 38
A radius joins the centre to the circumference. A diameter passes through the centre from one side to the other, so its length is twice the radius.