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'LOGO Challenge 11 - More on Circles' printed from https://nrich.maths.org/

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The result of the substitutions 314 and 100 into the two procedures produce the same circles.

This can be confirmed by rearranging the formula: $C=\pi d$.

Experimentation with this relationship through investigating the two procedures and creating circles which touch and/or which are related by particular enlargements all support familiarity with the relationship between the diameter and circumference of any circle.