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Increase Angle  Decrease Angle





Section Blue Green Red Total
Circle m²
Sphere litres

Free Printable Protractors

Printable Scalable Protractor Templates
Enter Angle and Radius in circle above and hit Calculate to re-draw the circle and display all distances across (Chord) and around (Arc) each section of the circle. The areas of each colored section and the entire circle are displayed in the table above, with volumes for sections of a sphere (ball).

Mouse over Animate arrows Increase Angle  Decrease Angle to auto increment / decrement the angle and re-draw the circle repeatedly to animate. To calculate form section heights, enter the known section height into the cross-section on the right and hit its Calculate button to re-draw the circle.

Need a Protractor? Printable Scalable Protractor Templates with incremental arc points and length by degree tables. Animate to scale, print and cut out template.



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