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The locus of a point which moves so that it is fixed distance from a given rectangle.
Drag points A, B and C around and change the value of the slider.

Software/Applets used on this page

JSXGraph
This page uses JSXGraph


JSXGraph is a cross-browser library for interactive geometry, function plotting, charting, and data visualization in a web browser. It is implemented completely in JavaScript, does not rely on any other library. It uses SVG and VML and is fully HTML5 compliant.

Glossary

function

A rule that connects one value in one set with one and only one value in another set.

locus

A set of points that fit a given rule.

Full Glossary List