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Plane Geometry
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Demonstrations 141  160 of 1042
Dudeney's Proof of the Pythagorean Theorem
The Areas of a Parallelogram and a Rectangle with the Same Base and Height Are Equal
Mechanism for Drawing a Logarithmic Spiral
Another OctagramToSquare Dissection
Drawing a Logarithmic Spiral
Trisecting an Angle Using Tschirnhaus's Cubic
Sum of Medians Divided by the Perimeter
Radius of Curvature of Catenary
Constructing the Square Root of a Positive Integer Geometrically
Locus of Points with Constant Angle
Tangents to a Rotating Ellipse
Multisecting an Angle Using Archimedes's Spiral
Equality of a Segment and an Arc in Archimedes's Spiral
Tangent to a Cycloid
Mechanism for Constructing Regular Polygons
Primitive Pythagorean Triples on a Curvilinear Grid Defined by Euclid's Formula
Trisecting an Angle Using a Conchoid
Rotation about a Point in the Plane
Matrix Transformations: "F"
Circumscribing Polygons
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