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Published byBenjamin Jensen
Modified over 4 years ago
Circles Yes I know we did this yesterday
Circumference Posh name for the perimeter of a circle Measured in normal units of length cm etc. But how do I work it out?
Glad you asked. First we need to remember the basics Radius pl. radii diameter
Get to the point. Circumference = 2πr (r = radius) = πd (d = diameter) π (pi) = 3.1416……… (goes on forever) Yes just like someone else
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
So what about area? Measured in square units Area = πr 2 (π x radius x radius)
Example Area = π x 5 2 = 25π = 78.5 cm 2 (to 1 d.p.) 5cm
C=π d C=2πr r=½d d=rx2 A=πr² The diameter is the longest chord. The ratio of the circumference is always …. π is a Greek letter. π can also.
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