Multiplicative relationships in circles
Lesson 1 / 16
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I can recognise that there is a constant multiplicative relationship (π) between the diameter and circumference of a circle.
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There is a multiplicative relationship between the radius and diameter of a circle.
The ratio between the diameter and circumference of a circle is always the same.
That ratio is called π and it is an irrational number.
The formula for the circumference of a circle is C = πd.
Using the definition of the diameter you can also write this as C = 2πr.
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