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# pentagon

«pentagon» in Mova's school dictionary: **a flat shape with 5 straight sides and 5 corners** — its meaning for a pupil, its sense in the lessons and examples.

### part of speech

noun (pentagon, pentagons; the Pentagon — a building)

### meaning for a pupil

1) A pentagon is a flat shape with 5 straight sides and 5 corners. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pentagon/#m1)

2) The Pentagon is a big five-sided building in the USA where the army leaders work. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pentagon/#m2)

### sense in the lessons

In maths: a shape with 5 sides; perimeter of a pentagon; counting sides; a regular pentagon has equal sides and equal angles. In nature and science: starfish and okra slices have five-part shapes. In everyday life: a soccer ball has pentagons on it; «home plate» in baseball is a pentagon.

### examples

- A pentagon has 5 sides. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pentagon/#x1)
- Each side of the pentagon is 4 cm. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pentagon/#x2)
- What is the perimeter of the pentagon? [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pentagon/#x3)
- How many sides do 3 pentagons have? [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pentagon/#x4)
- A classic soccer ball has 12 black pentagons. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pentagon/#x5)
- Home plate in baseball is shaped like a pentagon. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pentagon/#x6)
- Draw a pentagon and join its corners to make a star. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pentagon/#x7)
- The Pentagon is in Virginia. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/pentagon/#x8)

### note

Hidden number: 5 sides. Perimeter of a regular pentagon = 5 × side. Trap: not every pentagon has equal sides. The angles inside a regular pentagon are each 108 degrees. «Penta» means five, as in pentathlon. A shape with 6 sides is a hexagon.

### Trees and pragmatics

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