Circles (AQA GCSE Maths): Quizzes

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Circles
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What is the radius of a circle?

Distance from centre to edge

What is the diameter of a circle?

Distance across through centre

What is the circumference of a circle?

Distance around the edge

How is the diameter related to the radius?

Diameter = 2 × radius

Which formula finds circumference when you know the diameter?

C=πdC = \pi d

Which formula finds circumference when you know the radius?

C=2πrC = 2\pi r

What value of π\pi should you use in GCSE exam calculations?

π=3.142\pi = 3.142

A circle has radius 6cm. What is its circumference to 2 decimal places? (Use π=3.142\pi = 3.142)

37.70cm

If circumference is 120cm, what is the diameter to 1dp? (Use π=3.142\pi = 3.142)

38.2cm

When should you round your answer in circle calculations?

At the very end only

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