Triangle

:For alternative meanings, such as the musical instrument, see triangle (disambiguation).

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A triangle is one of the basic shapes of geometry: a two-dimensional figure with three vertices and three sides which are straight line segments.

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Triangles can be classified according to the relative lengths of their sides:

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• In an equilateral triangle all sides are of equal length. An equilateral triangle is also equiangular, i.e. all its internal angles are equal—namely, 60°; it is a regular polygon
• In an isosceles triangle two sides are of equal length. An isosceles triangle also has two equal internal angles.
• In a scalene triangle all sides have different lengths. The internal angles in a scalene triangle are all different.

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EquilateralIsoscelesScalene

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Triangles can also be classified according to the size of their largest internal angle, described below using degrees of arc.

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• A right triangle (or right-angled triangle) has one 90° internal angle (a right angle). The side opposite to the right angle is the hypotenuse; it is the longest side in the right triangle. The other two sides are the legs of the triangle.
• An obtuse triangle has one internal angle larger than 90° (an obtuse angle).
• An acute triangle has internal angles that are all smaller than 90° (three acute angles).

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RightObtuseAcute

Triangle: Types of triangles ►



 

Musical instrument: A musical instrument is a device that has been constructed or modified with the purpose of making music. In principle, anything that produces sound, and can somehow be controlled by a musician, can serve as a musical instrument; but the expression is reserved generally to items that have that specif...

Triangle (disambiguation): A triangle can refer to:...

Geometry: Geometry (Greek Γεωμετρια, geo = earth, metria = measure) arose as the field of knowledge dealing with spatial relationships. It was one of the two fields of pre-modern mathematics, the other being the study of numbers. In modern times, geometric c...




Triangle related Images and Photos (experimental)

Triangle	Triangle Portrait	Tao Triangle	Iron Triangle, The
Triangle: Remembering the Fire	Triangle: Remembering the Fire (MOD)	Iron Man Movie Triangle ARC Light	Black Rectangle Blue Triangle c.1915
Trolley Trips on a Bay State Triangle c.1897	Iron Man 2 Arc Light -- Triangle	Black Hearts One Platoons Descent into Madness in Iraqs Triangle of Death (Hardcover) Book