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Plane Geometry
Demonstrations 1 - 20 of 719
The Area between Two Circles
New this week
Area of the Arbelos
New this week
The Area of Part of an Isosceles Triangle
New this week
The Arbelos
Updated this week
Through Any Three Points
New this month
Angle Bisectors of Intersecting Two Lines
Updated this month
Different Slants on Simple Geometric Figures
Area of Epicycloid and Hypocycloid
Area under a Cycloid
The Sum of the Interior Angles of a Triangle Equals 180 Degrees by Paper Folding
A Test for the Convexity of a Quadrilateral
Fractals Generated by Multiple Reflections of Circles
The Seven Circles Theorem
Intersecting Line Segments
The Johnson Circles
Test Your Spatial Visualization Abilities
Farkas's Lemma in Two Dimensions
Polar Angles and Points on the Unit Circle
Six Circles Theorem
Triangles in the Poincaré Disk
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