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# triangle

noun (triangle, triangles)

«triangle» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. A triangle is a flat shape with three straight sides and three corners (angles). A triangle has 3 sides. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#m1)
2. A triangle is a musical instrument: a metal bar bent into a triangle that you hit with a small rod. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#m2)
3. A triangle is anything shaped like a triangle, like a slice of pizza or a warning sign. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#m3)
4. A triangle can also be a group of three people or things that are linked and cause conflict, such as a love triangle. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#m4)

### In the lessons

Maths: a shape with 3 sides; perimeter is the sum of the three sides; counting shapes, sides and corners; kinds: equilateral (all sides equal), isosceles (two equal), right-angled; the angles add to 180 degrees. Music: playing the triangle. Safety: triangle road signs warn of danger.

### Examples

- A triangle has 3 sides. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x1)
- Each side of the triangle is 5 cm. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x2)
- She drew 6 triangles. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x3)
- How many sides do 4 triangles have? [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x4)
- The angles of a triangle add up to 180 degrees. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x5)
- He played the triangle in the school band. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x6)
- Cut the sandwich into triangles. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x7)
- A triangle road sign warns drivers of danger ahead. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x8)
- "The swans fly in an oblique line; the cranes, in the form of a triangle; and the plovers, in a curved line like a snake." [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x9)

### Note

Countable: a triangle, triangles. A triangle hides the number 3: sides = triangles × 3. The perimeter is the sum of the three sides. Trap: a triangle can be any size or turned any way and still be a triangle.

## On Mova

- [Trees and pragmatics of «triangle» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«triangle» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/triangle.html) on Mova free.