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.

Drag points A, B and C around and change the value of the slider.

## Software/Applets used on this page

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.

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.

## This question appears in the following syllabi:

Syllabus | Module | Section | Topic | Exam Year |
---|---|---|---|---|

AQA GCSE (9-1) Foundation (UK) | G: Properties and Constructions | G11: Problem Solving with Coordinate Axes | Plotting Loci | - |

CIE IGCSE (9-1) Maths (0626 UK) | 3 Geometry | C3.8 Problem Solving with Loci | Plotting Loci | - |

Edexcel GCSE (9-1) Foundation (UK) | G: Properties and Constructions | G11: Problem Solving with Coordinate Axes | Plotting Loci | - |

GCSE Higher (UK) | Algebra | Graphs | Loci | - |

OCR GCSE (9-1) Foundation (UK) | 8: Basic Geometry | 8.01g: x- and y-Coordinates | Plotting Loci | - |

Universal (all site questions) | G | Graphs | Loci | - |