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High School Geometry
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Demonstrations 61  80 of 309
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
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
Similar Right Triangles
Equilateral Triangles That Form a Star
Circumcenter of a Triangle
Interior Angles of a Triangle
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