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In geometry, an isosceles triangle (/ aɪ ˈ s ɒ s ə l iː z /) is a triangle that has two sides of equal length. 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.
The leaves of C. acinaciformis are stout, scimitar-shaped ("acinaciform") and have the shape of an isosceles triangle in cross-section, if cut perpendicularly. They have a dull glaucous-green colour (sometimes with reddish edges or angles).
The leaves are usually a glaucous green, sometimes reddish along the leaf's edges or angles. The leaf shape is relatively straight, curving mainly at apex. The apex often has a serrated, reddish keel and mucro. The leaves are also somewhat flattened laterally, causing them to form an isosceles triangle in cross-section.
The pons asinorum in Oliver Byrne's edition of the Elements [1]. In geometry, the theorem that the angles opposite the equal sides of an isosceles triangle are themselves equal is known as the pons asinorum (/ ˈ p ɒ n z ˌ æ s ɪ ˈ n ɔːr ə m / PONZ ass-ih-NOR-əm), Latin for "bridge of asses", or more descriptively as the isosceles triangle theorem.
Triangles have many types based on the length of the sides and the angles. A triangle whose sides are all the same length is an equilateral triangle, [3] a triangle with two sides having the same length is an isosceles triangle, [4] [a] and a triangle with three different-length sides is a scalene triangle. [7]
Isosceles triangle; List of triangle inequalities; List of triangle topics; Pedal triangle; Pedoe's inequality; ... Cross section; Crystal; Cuisenaire rods; Desargues ...
A central cross section of a regular tetrahedron is a square. ... An equilateral triangle base and three equal isosceles triangle sides. It gives 6 isometries ...
In architecture, an example can be seen in the cross-section of the Gateway Arch and the surface of the Vegreville egg. [25] [26] It appears in the flag of Nicaragua and the flag of the Philippines. [27] [28] It is a shape of a variety of road signs, including the yield sign. [29] The equilateral triangle occurs in the study of stereochemistry.