Triangles
Circles
Angles
Polygons
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Section
Blue
Green
Red
Total
Circle m²
Sphere litres
Free Printable Protractors
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
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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