Circumference and area of circles
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Log in to continueChoose the right circle formula and distinguish radius, diameter and units.
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Use π ≈ 3.14. What is the circumference of the circle? Give your answer to 2 decimal places.
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A circle has radius 2 centimetres, measured from the centre to the edge.
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Answer: 12.56 cm
- The diameter is 2 × 2 = 4 cm.
- C = 2πr ≈ 2 × 3.14 × 2 = 12.56 cm.
- 2 × 157/50 × 2 = 314/25.
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Curriculum reference
Victorian Curriculum F–10 Version 2.0
Pi Leo practice scope
Choose the right circle formula and distinguish radius, diameter and units.
Read the official VCAA curriculum description (VC2M8M03)
These quizzes practise concepts within this topic. Multiple-choice answers alone do not demonstrate drawing, conducting an investigation or using a digital tool.
- VC2M8M03-C01Calculate circumference using radius or diameter.
- VC2M8M03-C02Calculate area using the radius.
- VC2M8M03-C03Apply and explain circumference and area of circles using read and connect representations.
- VC2M8M03-C04Apply and explain circumference and area of circles using work backwards from what is known.
- VC2M8M03-C05Apply and explain circumference and area of circles using build and check a model.
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Subskills
These practice subskills map to the curriculum topic. Guided activities cover skills beyond multiple-choice questions.
Descriptor-derived subskills
- D01Distance around a circleCalculate circumference using radius or diameter.
- D02Surface inside the circleCalculate area using the radius.
- D03Read and connect representationsApply and explain circumference and area of circles using read and connect representations.
- D04Work backwards from what is knownApply and explain circumference and area of circles using work backwards from what is known.
- D05Build and check a modelApply and explain circumference and area of circles using build and check a model.