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ROLL · REARRANGE · DISCOVER

Circle Lab

See where the circle formulas come from.

Circumference · Area · Sectors

One full turn

CIRCUMFERENCE

One turn. One circumference.

Radius r: 5 cm

Sector angle θ: 90°

Number of sectors

Roll progress

Full circle guide Sector perimeter

0 correct

Your answer (2 decimal places)

Radius

Diameter

π

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Use π at full calculator precision. Lengths are in cm; areas in cm². Results are rounded to 2 decimal places.

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