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1. Dictionary

   triangle

   /ˈtrʌɪaŋɡl/

   noun

   • 1. a plane figure with three straight sides and three angles: "an equilateral triangle"
   • ▪ a thing shaped like a triangle: "a small triangle of grass"
   • ▪ a musical instrument consisting of a steel rod bent into a triangle and sounded by being struck with a small steel rod.
   • ▪ a frame used to position the pool balls in snooker and pool.
   • ▪ a drawing instrument in the form of a right-angled triangle. North American
   • ▪ a frame of three halberds joined at the top to which a soldier was bound for flogging. historical
   • 2. an emotional relationship involving a couple and a third person with whom one of them is also involved.
   • 3. a small brownish Eurasian moth of oak and beech woods.

   Word Origin late Middle English: from Old French triangle or Latin triangulum, neuter of triangulus ‘three-cornered’ (see tri-, angle1).

   Scrabble Points: 9

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2. www.splashlearn.com › geometry › triangleTriangles in Geometry - Definition, Shape, Types, Properties

   www.splashlearn.com › geometry › triangle

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   A triangle is a three-sided polygon that has 3 angles, and 3 vertices. Learn the definition of triangles, their types, parts, properties using a variety of examples.

3. Videos

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     6:14

     byjus.com

     Triangle Definition (Types, Formula, and Properties of a Triangle)

     24 Sep 2016

     825.1K views

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     23:02

     youtube.com

     Triangles - Basic Introduction, Geometry

     27 Dec 2017

     612.3K views

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     bbc.co.uk

     What are the different types of triangle? - BBC Bitesize

     2 Sep 2018

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4. en.wikipedia.org › wiki › TriangleTriangle - Wikipedia

   en.wikipedia.org › wiki › Triangle

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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 points while the sides connecting them, also called edges, are one-dimensional line segments.

5. www.bbc.co.uk › bitesize › articlesWhat are the different types of triangle? - BBC Bitesize

   www.bbc.co.uk › bitesize › articles

   Discover the different types of triangles and find out the difference between an equilateral, scalene, isosceles and right-angled triangle in this KS2 guide.

6. byjus.com › maths › trianglesTriangles in Geometry (Definition, Shape, Types, Properties ...

   byjus.com › maths › triangles

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   Learn what a triangle is, how to classify it based on its sides and angles, and how to calculate its perimeter and area. Explore the properties and formulas of different types of triangles with examples and video lessons.

   • Video Duration: 6 min

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7. www.mathsisfun.com › triangleTriangles - Equilateral, Isosceles and Scalene - Math is Fun

   www.mathsisfun.com › triangle

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   A triangle is a polygon with three sides and three angles that add up to 180°. Learn about the different types of triangles, such as equilateral, isosceles and scalene, and how to calculate their perimeter and area using formulas and examples.

8. doodlelearning.com › maths › skillsAll About Triangles - Definition, Examples, Formulas

   doodlelearning.com › maths › skills

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   A triangle is a two-dimensional shape with three sides, three angles, and three vertices (the points where the sides connect). Because it has three or more sides, a triangle is also considered a polygon, so it belongs in the same shape family as the square, the rectangle, and even the decagon (which has ten sides!).

9. People also ask

   What does triangle mean?

   • For other uses, see Triangle (disambiguation). 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.

   Triangle - Wikipedia

   en.wikipedia.org/wiki/Triangle

   See all results for this question

   How are triangles classified?

   • Triangles are classified into different types based on their angles and the lengths of their sides. Relations between angles and side lengths are a major focus of trigonometry. In particular, the sine, cosine, and tangent functions relate side lengths and angles in right triangles.

   Triangle - Wikipedia

   en.wikipedia.org/wiki/Triangle

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   What is a triangle with 3 sides and 3 edges?

   • Below given is a triangle having three sides and three edges, which are numbered as 0,1,2. As we discussed in the introduction, a triangle is a type of polygon, which has three sides, and the two sides are joined end to end is called the vertex of the triangle. An angle is formed between two sides. This is one of the important parts of geometry.

   Triangles in Geometry (Definition, Shape, Types, Properties & Examples)

   byjus.com/maths/triangles/

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   What are the three angles of a triangle?

   • In the triangle given above: The three angles are, ∠PQR, ∠QRP, and ∠RPQ. The three sides are side PQ, side QR, and side RP. Note: The sum of all the angles of the triangle is equal to 180°. All geometrical shapes have different properties related to sides and angles that help us to identify them.

   Triangles - Definition, Properties, Formula | Triangle Shape - Cuemath

   www.cuemath.com/geometry/triangles/

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   What are the sides of a triangle called?

   • In triangle ABC, the sides are AB, BC, and CA. The angle formed by any two sides of a triangle is the angle of the triangle, denoted by the symbol ∠. A triangle has three angles. The three angles of the triangle ABC are ∠ABC, ∠BCA, and ∠CAB. These angles are also called ∠B, ∠C, and ∠A, respectively.

   Triangles in Geometry - Definition, Shape, Types, Properties - SplashLearn

   www.splashlearn.com/math-vocabulary/geometry/triangle

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   How many sides and angles does a triangle have?

   • A triangle is a simple polygon with 3 sides and 3 interior angles. It is one of the basic shapes in geometry in which the 3 vertices are joined with each other and it is denoted by the symbol △. There are various types of triangles that are classified on the basis of the sides and angles. A triangle consists of various parts.

   Triangles - Definition, Properties, Formula | Triangle Shape - Cuemath

   www.cuemath.com/geometry/triangles/

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10. www.cuemath.com › geometry › trianglesTriangles - Definition, Properties, Formula | Triangle Shape

    www.cuemath.com › geometry › triangles

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    A triangle is a closed shape with 3 angles, 3 sides, and 3 vertices. Learn about the parts, properties, formulas, and types of triangles with examples and worksheets.