[Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/dictionaries/school/w/triangle.html)

[home](https://md.mova.elamur.ai/free/en/) / [dictionaries](https://md.mova.elamur.ai/free/en/dictionaries/) / [The school dictionary](https://md.mova.elamur.ai/free/en/dictionaries/school/) / triangle

[← T](https://md.mova.elamur.ai/free/en/dictionaries/school/T/)

# triangle

«triangle» in Mova's school dictionary: **a flat shape with three straight sides and three corners…** — its meaning for a pupil, its sense in the lessons and examples, with 5 sentences of Mova's corpora that use it.

### part of speech

noun (triangle, triangles)

### meaning for a pupil

1) A triangle is a flat shape with three straight sides and three corners (angles). A triangle has 3 sides. [tree →](https://md.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://md.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://md.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://md.mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#m4)

### sense 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://md.mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x1)
- Each side of the triangle is 5 cm. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x2)
- She drew 6 triangles. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x3)
- How many sides do 4 triangles have? [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x4)
- The angles of a triangle add up to 180 degrees. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x5)
- He played the triangle in the school band. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x6)
- Cut the sandwich into triangles. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/#x7)
- A triangle road sign warns drivers of danger ahead. [tree →](https://md.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://md.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.

### In the corpora

- [Hold a great white tooth in your hand: a triangle with saw edges.](https://md.mova.elamur.ai/free/en/corpora/school/biology/310-sharks-by-kind-great-white-tiger-bull-and-hammerhead/2/)
- [The fire triangle: fire needs fuel, heat and oxygen, and goes out if one is taken away.](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/12-fire-what-it-needs/5/)
- [Pythagoras studied triangles, Archimedes discovered how things float and shouted Eureka, and Eratosthenes measured the size of the Earth with shadows.](https://md.mova.elamur.ai/free/en/corpora/school/history/12-ancient-greece-democracy-olympics-myths-and-thinkers/17/)
- [A triangle has 3 sides.](https://md.mova.elamur.ai/free/en/corpora/school/lessons/136-perimeter-of-a-triangle/1/)
- [A triangle has 3 corners and 3 sides; a square and a rectangle each have 4 corners and 4 sides.](https://md.mova.elamur.ai/free/en/corpora/school/lessons/217-corners-of-bunting-flags/0/)

### Trees and pragmatics

[Every meaning and example of «triangle» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/T/triangle/), each sentence with its dependency tree and frames.