Meaning of TRIANGLE in English

TRIANGLE

tri ‧ an ‧ gle /ˈtraɪæŋɡ ə l/ BrE AmE 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

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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

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.