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**triangle**(n = noun.shape) trigon, trilateral - a three-sided polygon;
is a kind of
polygon,
polygonal shape
**triangle**(n = noun.shape) - something approximating the shape of a triangle; "the coastline of Chile and Argentina and Brazil forms two legs of a triangle"
is a kind of
form,
shape
**triangle**(n = noun.object) triangulum - a small northern constellation near Perseus between Andromeda and Aries;
is a kind of
constellation
**triangle**(n = noun.artifact) - any of various triangular drafting instruments used to draw straight lines at specified angles;
is a kind of
drafting instrument
**triangle**(n = noun.artifact) - a percussion instrument consisting of a metal bar bent in the shape of an open triangle;
is a kind of
percussion instrument,
percussive instrument

has particulars: acute-angled triangle, acute triangle, equiangular triangle, equilateral triangle, isosceles triangle, oblique triangle, obtuse-angled triangle, obtuse triangle, right-angled triangle, right triangle, scalene triangle, cuneus, wedge, wedge shape

Derived forms adjective triangular

- A figure bounded by three lines, and containing three angles. [
*1913 Webster*]" A triangle is either plane, spherical, or curvilinear, according as its sides are straight lines, or arcs of great circles of a sphere, or any curved lines whatever. A plane triangle is designated as scalene, isosceles, or equilateral, according as it has no two sides equal, two sides equal, or all sides equal; and also as right-angled, or oblique-angled, according as it has one right angle, or none; and oblique-angled triangle is either acute-angled, or obtuse-angled, according as all the angles are acute, or one of them obtuse. The terms scalene, isosceles, equilateral, right-angled, acute-angled, and obtuse-angled, are applied to spherical triangles in the same sense as to plane triangles." [*1913 Webster*] - An instrument of percussion, usually made of a rod of steel, bent into the form of a triangle, open at one angle, and sounded by being struck with a small metallic rod. [
*1913 Webster*] - A draughtsman's square in the form of a right-angled triangle. [
*1913 Webster*] - A kind of frame formed of three poles stuck in the ground and united at the top, to which soldiers were bound when undergoing corporal punishment, -- now disused. [
*1913 Webster*] - A small constellation situated between Aries and Andromeda. [
*1913 Webster*]

1 a plane figure with three sides and angles.

2 any three things not in a straight line, with imaginary lines joining them.

3 an implement of this shape.

4 a musical instrument consisting of a steel rod bent into a triangle and sounded by striking it with a small steel rod.

5 a situation, esp. an emotional relationship, involving three people.

6 a right-angled triangle of wood etc. as a drawing-implement.

7 Naut. a device of three spars for raising weights.

8 hist. a frame of three halberds joined at the top to which a soldier was bound for flogging.

Idiom

triangle of forces a triangle whose sides represent in magnitude and direction three forces in equilibrium.

Etymology

ME f. OF triangle or L triangulum neut. of triangulus three-cornered (as TRI-, ANGLE(1))

See related words and definitions of word "triangle" in Indonesian