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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.

This question appears in the following syllabi:

SyllabusModuleSectionTopicExam Year
AQA GCSE (9-1) Foundation (UK)G: Properties and ConstructionsG11: Problem Solving with Coordinate AxesPlotting Loci-
CIE IGCSE (9-1) Maths (0626 UK)3 GeometryC3.8 Problem Solving with LociPlotting Loci-
Edexcel GCSE (9-1) Foundation (UK)G: Properties and ConstructionsG11: Problem Solving with Coordinate AxesPlotting Loci-
GCSE Higher (UK)AlgebraGraphsLoci-
OCR GCSE (9-1) Foundation (UK)8: Basic Geometry8.01g: x- and y-CoordinatesPlotting Loci-
Universal (all site questions)GGraphsLoci-