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Published byBenjamin Jensen Modified over 3 years ago

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Circles Yes I know we did this yesterday

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Circumference Posh name for the perimeter of a circle Measured in normal units of length cm etc. But how do I work it out?

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Glad you asked. First we need to remember the basics Radius pl. radii diameter

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Get to the point. Circumference = 2πr (r = radius) = πd (d = diameter) π (pi) = 3.1416……… (goes on forever) Yes just like someone else

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One for you to try C = 2 x π x r = 2 x π x 6 = 12 π = 37.7cm (to 1 d.p.) 6cm

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So what about area? Measured in square units Area = πr 2 (π x radius x radius)

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Example Area = π x 5 2 = 25π = 78.5 cm 2 (to 1 d.p.) 5cm

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Circles Formulas Circumference = π * diameter C = πd Area = π * r2

Circles Formulas Circumference = π * diameter C = πd Area = π * r2

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