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Plane Geometry
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Demonstrations 141  160 of 1029
Rotation about a Point in the Plane
Matrix Transformations: "F"
Circumscribing Polygons
Archimedes' Approximation of Pi
Angle and Length Measurement of a Polygon
Circles of Apollonius
NinePoint Circle
Geometric Elements of a Circle
Focus and Directrix in a Quadratic Bézier Curve
Rational Cubic Bézier Curves
Exterior Tangents to Three Circles
Diocles's Solution of the Delian Problem
Clairaut's Angle Trisection
Descartes's Angle Trisection
Pedal Curves of Conics
Incommensurability of the Base and Leg in an Isosceles Triangle
Area of a Triangle
Translation of the Plane
Find the Angle Measure in a Regular Polygon, Part 2
Theobald's Dissection of an Octagon into a Triangle
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