Meaning & use
concave polygon
A polygon that has at least one interior angle greater than 180 degrees, causing part of the shape to cave inward.
See it in a sentence
A star shape is a classic example of a concave polygon.
Students learned to identify a concave polygon by checking whether any interior angle exceeds a straight line.
A note on using this word
A concave polygon always has at least one vertex that points inward, unlike a convex polygon, where every interior angle is less than 180 degrees.
Words with a similar meaning
This term is best learned through its definition and examples.
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
convex polygon
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