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Summary Of: Triangles
Triangles can be classified according to the relative lengths of their sides... Some definitions state that isosceles triangles have only two equal sides... Triangles can also be classified according to their... are right triangles with additional properties that make calculations involving them easier... Triangles that do not have an angle that measures 90... Triangles are assumed to be two... Elementary facts about triangles were presented by... Two triangles are said to be... The corresponding sides of similar triangles have lengths that are in the same proportion... If two corresponding internal angles of two triangles have the same measure... If two corresponding sides of two triangles are in proportion... If three corresponding sides of two triangles are in proportion... for a pair of triangles to be congruent... condition does not by itself guarantee that the triangles are congruent because one triangle could be obtuse... Using right triangles and the concept of similarity... the measures of the internal angles in planar triangles always sum to 180... Euclid defines isosceles triangles based on the number of equal sides... An alternative approach defines isosceles triangles based on shared properties... equilateral triangles are a special case of isosceles triangles... All pairs of congruent triangles are also similar... Software package for creating illustrations of facts about triangles and other theorems in Euclidean geometry... completes triangles when given three elements... Encyclodia Page On: Triangles
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