Isosceles triangle
Area
This is a special case of the general formula for the area of a triangle as half the product of two sides times the sine of the included angle.
Isosceles triangle
In geometry, an isosceles triangle () is a triangle that has two sides) of equal length and two angles of equal measure. Sometimes it is specified as having exactly two sides of equal length, and sometimes as having at least two sides of equal length, the latter version thus including the equilateral triangle as a special case. Examples of isosceles triangles include the isosceles right triangle, the golden triangle), and the faces of bipyramids and certain Catalan solids.
Isosceles triangle
The mathematical study of isosceles triangles dates back to ancient Egyptian mathematics and Babylonian mathematics. Isosceles triangles have been used as decoration from even earlier times, and appear frequently in architecture and design, for instance in the pediments and gables of buildings.
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