How to Use
Drag the gold handle on the circle to resize the circle.
Drag the round handles on the radii to change angles and sectors.
Use Parts of a Circle to highlight radius, diameter, chord, arc, sector and circumference.
Use Parts Quiz to identify the highlighted circle part.
Use Build the Angle to make target angles with the moving radius.
Use Fraction Circle to split and shade equal parts of a circle.
Use Pi to unwrap the distance around the circle.