Circumference
The circumference is always a bit more than 3 × diameter: C = πd
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A fixed ratio hides between circumference and diameter: the circumference is always a bit more than 3 times the diameter — that multiplier is pi, π ≈ 3.14. Tap “Roll” to send a marked circle one full turn along a line; the distance covered is the circumference — measure it yourself and meet π.
Tap “Roll”: a circle with a marked point rolls one full turn along a line — the distance covered is its circumference. Measuring shows it's always just over 3 diameters: that's π ≈ 3.14.