Connect radius, diameter and circumference
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Log in to continueInvestigate the constant circle ratio represented by π.
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A circle has radius 3 cm. What is its diameter?
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A circle with radius 3 cm.
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Answer: 6 cm
- A diameter is twice the radius.
- 2 × 3 = 6 cm.
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Curriculum reference
Victorian Curriculum F–10 Version 2.0
Pi Leo practice scope
Investigate the constant circle ratio represented by π.
Read the official VCAA curriculum description (VC2M7M03)
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Activities to practise beyond the quiz
- Supported by the guided activity; selecting an MCQ does not demonstrate this action.
- VC2M7M03-C01A diameter passes through the centre and has twice the radius. It is a straight-line distance, not the boundary length.
- VC2M7M03-C02For any circle, circumference divided by diameter is π. Using 3.14 gives an approximation, so the calculated boundary length is approximate.
- VC2M7M03-C03The circumference grows in the same proportion as the diameter. A fixed approximation to π can be used consistently across examples.
- VC2M7M03-C04Investigating and describing the relationship between π, circumference, radius and diameter.
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Descriptor-derived subskills
- D01Connect two radii to one diameterA diameter passes through the centre and has twice the radius. It is a straight-line distance, not the boundary length.
- D02Use the circle ratioFor any circle, circumference divided by diameter is π. Using 3.14 gives an approximation, so the calculated boundary length is approximate.
- D03Apply the same relationshipThe circumference grows in the same proportion as the diameter. A fixed approximation to π can be used consistently across examples.