AQA · Mathematics · 8300
GCSE Maths: Circles: circumference
Geometry & Measures · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths textbook exercise and practice questions for Circles: circumference (Corbettmaths Video 60), and every card links back to the exact page it came from. Practice tests are drawn from this deck’s own cards. Source material © Corbettmaths — used with attribution.
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? is the distance around the edge of a circle.
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Circumference
What is the formula for the circumference of a circle with radius r?
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C = 2πr
What does it mean to express a circumference 'in terms of π'?
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Leave π as a symbol in the answer rather than calculating a decimal value.
How do you find the diameter of a circle if you know the circumference?
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Divide the circumference by π (d = C/π)
What is the perimeter of a semicircle with radius r?
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πr + 2r (half the circumference plus the diameter)
If a runner completes one lap of a circular track, what distance have they traveled?
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The circumference of the circle.
What is the formula relating distance, speed, and time?
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Distance = Speed × Time, or equivalently Speed = Distance ÷ Time.
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