noun
pentagon
PEN-tuh-gahn/ˈpentəɡɑːn/
A flat shape with five straight sides.
The pentagon has five straight sides and five corners.
Etymology
The pieces describe a “five-angled” figure. Counting its five corners also counts its five straight sides, so the original description matches the geometric meaning.
In context
penta comes from a greek word which means five you might recognize this prefix from the word pentagon which is a five-sided shape
More examples
- They cut a pentagon from cardboard.
- Each pentagon in the pattern had equal sides.
- The teacher asked us to identify the pentagon.
Forms
pentagon · pentagons
pentagonal adjective — having five sides
Similar words
- five-sided polygon
- The explicit geometric description.