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. Wikipedia

Area: various methods; see below

Longest side: the hypotenuse

Sum of interior angles: 180°

Number of vertices: 3

Number of edges: 3

Line of symmetry: 3

Rotational symmetry order: 3

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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 ...

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(US, Canada) A set square. (music) A percussion instrument made by forming a metal rod into a triangular shape which is open at one angle.

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