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triangle

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triangle
tri‧an‧gle /ˈtraɪæŋɡəl/ noun [countable]
 Date: 1300-1400
 Language: Latin
 Origin: triangulum, from tri- ( ⇨ tri-) + angulus 'angle'

1. a flat shape with three straight sides and three angles
2. something that is shaped like a triangle:
    a triangle of land
3. a musical instrument made of metal bent into the shape of a triangle. You hit it with a metal stick to make a ringing sound.
4. American English a flat plastic object with three sides that has one angle of 90° and is used for drawing angles
   SYN  set-square British English
     
THESAURUS
■ types of shapes
   ▪ square a shape with four straight sides that are equal in length and four angles of 90 degrees
   ▪ circle a round shape that is like an O
   ▪ semicircle half a circle
   ▪ triangle a shape with three straight sides and three angles
   ▪ rectangle a shape with four straight sides and four angles of 90 degrees
   ▪ oval a shape like a circle, but that is longer than it is wide
   ▪ cylinder an object in the shape of a tube
   ▪ cube a solid object with six equal square sides
   ▪ pyramid a shape with a square base and four triangular sides that meet in a point at the top
   ▪ sphere a shape like a ball