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 Encyclopedia of Triangle Centers - Clark Kimberling A searchable catalogue of hundreds of special triangle points (centroid, incenter, Hofstadter points, Yff centers, Apollonius point, etc.), with a glossary, collinearities, graphics, and links to biographical sketches of geometers, geometry software and sites, and more. For pictures and constructions of selected cases, see Triangle Centers. more>> Geometric Formulas (Ask Dr. Math FAQ) - Math Forum Formulas for two-dimensional figures: triangle (equilateral, isosceles, right, scalene); quadrilateral (general, square, rectangle, parallelogram, rhombus, trapezoid, kite, cyclic and cyclic-inscriptable); regular polygon; circle (arc, segment, sector); ellipse; parabolic segment; and three-dimensional figures: rectangular parallelepiped (cube); prism; pyramid (square pyramid, frustum); regular polyhedron (tetrahedron, cube, octahedron, dodecahedron, icosahedron); cylinder (right circular); cone (right circular, frustum); sphere (sector, cap, segment, zone, lune); ellipsoid; circular torus; spherical polygon. Includes Defining Geometric Figures. more>> Mrs. Glosser's Math Goodies - Gisele Glosser Interactive math lessons that work online and offline in a Web browser, and provide immediate feedback to students, with in addition Worksheets (on circumference and area; exponents; expressions and equations; integers; Ocean Math; order of operations; percent; perimeter and area; probability; and statistics), Math Chat Boards, Math Puzzles, a Math Image Library, Educational Links, Homework Suggestions, and more. Lessons include examples, exercises, and solutions. Volumes include: Introduction to Statistics; Topics in Pre-Algebra; Probability Lessons; Integers; Understanding Percent; Number Theory; Circumference and Area of Circles; Perimeter and Area of Polygons; and Solutions. These math lessons are shareware and may be used online; registered users may save them to their desktop computers. Leçons en français are also available in French: Théorie des nombres; Circonférence et aire des circles; et Périmètre et aire des polygones. more>> Naming Polygons and Polyhedra - Math Forum, Ask Dr. Math FAQ What do you call an 11-sided polygon? A 14-sided polygon? Is there a list of names of polygons? What about polyhedra? more>> The Pythagorean Theorem - Math Forum, Ask Dr. Math FAQ What is the Pythagorean theorem? When would you use it? How can we prove it? more>> Quadrilateral Formulas (Ask Dr. Math FAQ) - Math Forum Formulas for finding the area, perimeter, etc. of a quadrilateral: square, rectangle, parallelogram, rhombus, trapezoid, trapezium, kite, and cyclic quadrilateral. more>> Regular Polygon Formulas (Ask Dr. Math FAQ) - Math Forum Formulas for finding the area, perimeter, etc. of a regular polygon, and constructing regular polygons with compass and straightedge, in particular the pentagon. more>> Triangle Centers - Clark Kimberling; Dept. of Mathematics, Univ. of Evansville, Evansville, IN A listing, with description and illustration, of 20th-century triangle centers (including: Schiffler Point, Exeter Point, Parry Point, congruent isoscelizers point, Yff Center of Congruence, isoperimetric point and equal detour point, Ajima-Malfatti Points, Apollonius Point, Morley Centers, Hofstadter Points, and equal parallelians points) and some classical triangle centers (including: centroid, incenter, circumcenter, orthocenter, Fermat Point, nine-point center, symmedian (or Lemoine) point, Gergonne point, Nagel point, Mittenpunkt, Spieker center, Feuerbach point, isodynamic points, and Napoleon points), as well as other references (to print works) and a list of journals that frequently publish items of interest to triangle geometers. more>> Triangle Formulas (Ask Dr. Math FAQ) - Math Forum Formulas for finding the area, perimeter, etc. of an equilateral, isosceles, right, or scalene triangle. more>>
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