Trapezoid definition and properties
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Math Open Reference
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Trapezium definition and properties
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Math Open Reference
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Definition of Thales theorem - the diameter of a circle always subtends a right angle to any point on the circle.
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Math Open Reference
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Definition and properties of a tetragon
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Math Open Reference
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Definition and properties of pythagorean triples
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Math Open Reference
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A graphical demonstration of a proof of Pythagoras' Theorem.
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Math Open Reference
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Definition of the triangles of a polygon, including a formula to calculate the number of them in an n-gon
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Math Open Reference
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The sides of a polygon are defined and two formulas for finding the side length for a regular polygon.
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Math Open Reference
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Definition of a regular (equiangular) polygon
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Math Open Reference
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