Click the
red button ()
on the figure to start the animation.

Drag point B to change
the figure.

**Chord** is the line segment joining two points on a
circle.

**Circle** is the set of points in a plane that are
equidistant from a given point, called center.

**Concurrent:** Two or more lines are said to be concurrent
if they intersect at a single point.

**Dynamic Geometry:** You can alter the figure above
dynamically in order to test and prove (or disproved)
conjectures and gain mathematical insight that is less
readily available with static drawings by hand.

This page uses the
TracenPoche
dynamic geometry software and requires
Adobe Flash player 7 or higher.
TracenPoche is a project of Sesamath, an association of French
teachers of mathematics.