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High School Geometry
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Demonstrations 41  60 of 309
Euclid, Book 3, Proposition 22
Difference Formula for Cosine
Angle Bisectors of Two Intersecting Lines
Eratosthenes's Measure of the Earth's Circumference
The Area between Two Circles
Are the Lines Parallel?
The Sum of the Interior Angles of a Triangle Equals 180 Degrees by Paper Folding
Polyhedron Dual
The Statue of Regiomontanus
Folding an Equilateral Triangle in a Square
Enumerating Pythagorean Triangles
Crisscrossing a Polygon
Problems on Circles VII: Circles of a Given Size Tangent to Other Two
Cartesian Coordinates Exercise
Approximating Pi with Inscribed NonRegular Polygons
The Eutrigon Theorem
Twin Pythagorean Triples
Sum of Exterior Angles of a Polygon
Area of a Quadrilateral by Triangulation
An Intuitive Proof of the Pythagorean Theorem
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