Circles Flashcards by Fabian Byrne

Q

How do you work out the circumference of a circle with the diameter?

A

Circumference = π x diameter

C = πd

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Q

How do you work out the circumference of a circle with the radius?

A

Circumference = 2 x π x radius

C = 2πr

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Q

How do you work out the area of a circle?

A

π x radius squared

A = πr²

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Q

Circumference of a circle

A

1) C = πd

or

2) C = 2πr

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Q

Area of a circle

A

A = πr²

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