Enter Angle and Radius and hit

Calculate to re-draw the circle and display all measurements across (Chord) and around (Arc)
each section of the circle. The areas of each coloured section and the entire circle are displayed in the table above, with volumes for sections of a sphere.

Drag

Angle and

Radius sliders to calculate and animate the diagram.

Need a Protractor?

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

See also

Circle Divider for full scale circle division templates (clock face, protractor, or any circle increments)