A tool by
Leon Dudhill
Geometry
Explorer 2D
GCSE Maths
Drag vertices · Edit angles & sides · Interior & exterior angles always shown
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✦ Regularise
↺ Reset
Drag any vertex to reshape
Triangle selected
Drag any vertex to change the shape
Drag vertices to reshape · Edit angles & side lengths in the right panel · Buttons show number of sides
Shape Properties
All values update live
Measurements
Perimeter
—
Area
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Interior angle sum
—
Exterior angle sum
360°
Shape type
—
Also known as
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Angles
Side Lengths
(units)
Interior sum = (n−2)×180° · Exterior angle = 360° − interior · Interior + Exterior = 360°
Disclaimer:
Geometry Explorer 2D is a tool to help me study for my GCSE Maths. You are welcome to use it but it may have errors and shouldn't be relied on without independently fact checking answers.