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High School Geometry
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Demonstrations 121  140 of 309
Estimating Perimeter and Area of Simple Polygons
Mayan Pyramid
Two Lines Determine a Circle
Drawing an Ellipse Using Circles and Lines
Lattice Points on a Circle
Successive Averages of the Vertices of a Polygon
Cofunction Identities for Sine and Cosine
Napoleon's Theorem
Area of a Parallelogram
Ptolemy's Theorem
Euclid's Proof of the Pythagorean Theorem
The Perpendicular Bisector of a Chord
The Carpets Theorem
The Midpoint Quadrilateral Theorem
A Theorem about Two Tangent Circles
Crossed Ladders Theorem
Pythagoras Tree
Decomposition of the Tetrahedron into Four Congruent Symmetrical Parts
Bottema's Theorem
Hjelmslev's Theorem
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