The circumcircle of a polygon is defined: the circle that passes through every vertex.
Math Open Reference
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A biography of Euclid. A short description of his life and contributions to the study of geometry. Links to other resources.
Math Open Reference
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This page gives two methods for finding the area of a kite: a geometry formula and a trigonometric formula. Numerous connected pages offer a wide variety of information on all types of polygons.
Math Open Reference
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A biography of Pythagoras of Samos. A short description of his life and contributions to the study of geometry, including Pythagoras' Theorem. Links to other resources.
Math Open Reference
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How to find the area of an irregular polygon by breaking it down into triangles
Math Open Reference
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A site that allows to students to interact with various sized polygons and explore tesselations and symmetries.
Polygon Playground
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A biography of Thales. A short description of his life and contributions to the study of geometry. Links to other resources.
Math Open Reference
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Formula and description of the perimeter of a trapezoid.
Math Open Reference
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Trapezoid median (midline or midsegment) definition and properties
Math Open Reference
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Area of a trapezoid. Definition and formula
Math Open Reference
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