# Limaçon as a Pedal of a Circle

Given is a circle , and a fixed point . This will be the pedal point.
Let be a random point on , and line be the tangent to the circle at point .
The light blue point is the intersecting point of and the perpendicular through to .
As moves along , the foot of the perpendicular (the light blue point) will draw the

*pedal curve*of the circle. This curve will be a Limaçon.- Drag point
along the circle or press the play button. - Move the position of
: outside the circle, on the circle, or inside the circle, and see the change in the Limaçon.

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