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High School Geometry
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Demonstrations 101  120 of 309
How Area Changes with Diameter
Volume of Triangular Prisms
Albrecht Dürer's Pentagon of 1525
Simple ThreeLetter Cube
Conic Sections: The Double Cone
Classifying Quadrilaterals
Parabolic Envelope from Congruent Triangles
Pythagorean Triangles with the Same Area
Miquel's Theorem
Concyclic Circumcenters
Medial Division of Triangles
Angle Bisectors on the Circumcircle
Angle Measure
Estimating Perimeter and Area of Simple Polygons
Mayan Pyramid
Two Lines Determine a Circle
Drawing an Ellipse Using Circles and Lines
Cube Net
Lattice Points on a Circle
Successive Averages of the Vertices of a Polygon
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