pentagon
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 →
2) The Pentagon is a big five-sided building in the USA where the army leaders work. tree →
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 →
- Each side of the pentagon is 4 cm. tree →
- What is the perimeter of the pentagon? tree →
- How many sides do 3 pentagons have? tree →
- A classic soccer ball has 12 black pentagons. tree →
- Home plate in baseball is shaped like a pentagon. tree →
- Draw a pentagon and join its corners to make a star. tree →
- The Pentagon is in Virginia. tree →
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, each sentence with its dependency tree and frames.