tri‧an‧gle[countable]
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 [= set-square British English]
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