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Published byTrevor Williams Modified over 8 years ago

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The outside of the circle is called circumference The circumference is the distance around the circle.

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The midpoint of a circle is centre

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The line drawn from the centre to the circumference is … radius

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The line drawn from one circumference through the centre to another circumference is … radius diameter The diameter cuts the circle in half!

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A line that connects one point on the edge of the circle with another point on the circle is called …. chord The chord that passes through the centre of the circle is the diameter.

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A segment ie. part of the circumference of the circle is called an... a r c

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Parts of the Circle centre radius diameter chord arc

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Formulas D= 2*r example if the radius is 3 2*3=6 so the diameter is 6 R= d/2 (half the diameter) Example if the diameter is 10 then 10/2 = 5 So the radius is 5

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