how to measure a circle with a thread or rope?
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What To Do
1. Wrap your string around your ball.
Make a mark with a felt pen
where the end of your string touches the rest of the string.
2. Stretch out your string and see where the felt mark is. This is the circumference.
3.If available, line up interlocking Unifix® cubes all along the circumference-length of string.
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