Question 966599
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Tania took 10 steps to walk across the tether ball circle.
This is a measure of the diameter using Tania's steps as a unit of measure.
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Tania took 31 steps to walk around the circle. 
This the measure of the circumference using Tania's steps
The number of diameters in the circumference:
{{{circumference_steps/diameter_steps)}}}={{{31_steps/10_steps=3.1}}}
The answer here should approximate pi.