This website helps to find the measure of the fourth angle of a quadrilateral given the three other angle measures.
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AAA Math
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This site outlines the theorems about parallelograms with proofs to these theorems.
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Steve Wilson of Sonoma State University
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A page with links for properties of circles and different types of polygons. Each link has great visuals with clear markings, definitions, and formulas.
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Cool Math
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Describes the special relationships of the sides, angles, and diagonals of a rhombus.
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Zona Land
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Website gives a general overview of different types of quadrilaterals and how to identify them. Explains the properties of different quadrilaterals.
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Math.com
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This tutorial focuses on the properties and proofs surrounding trapezoids with a closer look at medians in trapezoids, with solid diagrams and detailed verbal descriptions.
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Think Quest
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Formula and description of the perimeter of a square.
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Math Open Reference
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Definiton and properties of the diagonals of a square
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Math Open Reference
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Area of a square. Definition and formula
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Math Open Reference
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