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Schläfli symbol. {3} (for equilateral) Area. various methods; see below. A triangle is a polygon with three corners and three sides, one of the basic shapes in geometry. The corners, also called vertices, are zero- dimensional points while the sides connecting them, also called edges, are one-dimensional line segments.
Glossary of mathematical symbols. A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various ...
A pink triangle in the original Nazi orientation. A pink triangle has been a symbol for the LGBT community, initially intended as a badge of shame, but later reappropriated as a positive symbol of self-identity. In Nazi Germany in the 1930s and 1940s, it began as one of the Nazi concentration camp badges, distinguishing those imprisoned because ...
The pink triangle was later reclaimed by gay men, as well as some lesbians, in various political movements as a symbol of personal pride and remembrance. [ 57 ] [ 58 ] AIDS Coalition to Unleash Power ( ACT-UP ) adopted the downward-pointing pink triangle to symbolize the "active fight back" against HIV / AIDS "rather than a passive resignation ...
Valknut variations. On the left unicursal trefoil forms; on the right tricursal linked triangle forms. The valknut is a symbol consisting of three interlocked triangles. It appears on a variety of objects from the archaeological record of the ancient Germanic peoples. The term valknut is a modern development; it is not known what term or terms ...
Nabla symbol. The nabla is a triangular symbol resembling an inverted Greek delta: [1] or ∇. The name comes, by reason of the symbol's shape, from the Hellenistic Greek word νάβλα for a Phoenician harp, [2][3] and was suggested by the encyclopedist William Robertson Smith in an 1870 letter to Peter Guthrie Tait. [2][4][5][6][7] The nabla ...
Internal angle (degrees) 60°. In geometry, an equilateral triangle is a triangle in which all three sides have the same length. In the familiar Euclidean geometry, an equilateral triangle is also equiangular; that is, all three internal angles are also congruent to each other and are each 60°.
convex, cyclic. Dual polygon. Self-dual. In geometry, an isosceles triangle (/ aɪˈsɒsəliːz /) 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 ...