High School Geometry
Demonstrations 61 - 80 of 309
 Regular Polygon Maker How Many Rectangles Are There? 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 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 Non-Regular 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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