easy
A triangle is a polygon with three sides.
What does Polygon mean?
A polygon is a closed 2D figure made from at least three straight sides.
Dictionary definition
In elementary geometry, a polygon is a closed, two-dimensional figure made from three or more straight line segments that meet endpoint to endpoint. Polygons can be regular or irregular and are named by their number of sides.
Example sentences
Polygon in a sentence
medium
A circle is not a polygon because its boundary is curved.
medium
An irregular polygon can have sides and angles of different measures.
hard
A regular polygon has equal side lengths and equal angle measures.
Writing practice
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Quick practice
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Practice the meaning of Polygon
Answer three quick questions about its meaning and related words.
Question 1 of 3
Practice 1
Which figure is a polygon?
A polygon must be closed, two-dimensional, and made only of straight segments.
Practice 2
What makes a polygon regular?
Regular polygons are both equilateral and equiangular.
Practice 3
Which statement is true?
A square meets all polygon conditions, but polygons can have many other forms.
Practice complete
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Polygon
Voice settings
Sounds like
pol · ee · gon · strongest beat: pol
Tap each sound part, then blend the whole word together.
Learn
WordPolygon.
Partnoun.
MeaningPolygon means A polygon is a closed 2D figure made from at least three straight sides.
ExampleExample: A triangle is a polygon with three sides.
Word breakdown
3 syllables. Say each part, then blend the word.
- Syllables
- pol · ee · gon
- Strongest beat
- pol
- Ending
- gon
- Tip
- Put a little extra energy on pol.
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Synonym review
Does Polygon have synonyms?
Polygon has no precise everyday synonym. Closed plane figure is a wider category, and straight-sided figure is an explanation that still needs the closed and two-dimensional conditions.
Antonym review
Does Polygon have an opposite?
Polygon names a category of figure and has no direct antonym. Circles, open figures, and curved figures are non-examples because they fail defining conditions, not opposites.
Word family
Polygon word family
Base word
polygon
noun
polygons
More than one closed straight-sided figure.
adjective
polygonal
Having the form or properties of a polygon.
adverb
polygonally
In a way that forms or uses polygons.
Related words
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Student support
Understand Polygon
Hint for students
For elementary geometry, check four ideas: two-dimensional, closed, at least three sides, and every side straight.
Common mix-up
A circle is a non-example, not an antonym. Regular means all sides and all angles are equal; a polygon can be valid without being regular.
Try it in class or at home
Create and classify polygons by side count, regularity, and convexity. Include near-misses and explain which defining condition each one fails.
Teacher prompt
Sort closed straight-sided figures, open figures, curved figures, regular polygons, and irregular polygons. Ask students to justify every decision with defining attributes.
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