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regular polygon
/ɹˈɛɡjuːlɚ pˈɑːlɪɡən/
noun
a two-dimensional closed shape with straight sides and equal angles between adjacent sides, and all sides have the same length
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irregular polygon
/ɪɹˈɛɡjuːlɚ pˈɑːlɪɡən/
noun
a polygon that does not have all sides or angles equal in size or measure, making it non-regular and lacking symmetry
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convex polygon
/kɑːnvˈɛks pˈɑːlɪɡən/
noun
a geometric shape that has all its interior angles measuring less than 180 degrees, causing the polygon to curve outward
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concave polygon
/kɑːnkˈeɪv pˈɑːlɪɡən/
noun
a geometric shape that has at least one angle measuring greater than 180 degrees, causing the polygon to curve inward
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trigon
/tɹˈaɪɡɑːn/
noun
a three-sided polygon
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quadrilateral
/kwˌɑːdɹɪlˈæɾɚɹəl/
noun
(geometry) a flat figure with four straight sides and four angles
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pentagon
/ˈpɛnɪˌɡɑn/, /ˈpɛntɪˌɡɑn/
noun
(geometry) a polygon with five angles and five straight sides
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hexagon
/ˈhɛksəˌɡɑn/
noun
(geometry) a closed shape with six straight sides and six angles
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heptagon
/hˈɛptəɡˌɑːn/
noun
a seven-sided plane shape consisting of seven line segments or edges that meet at seven interior angles
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octagon
/ˈɑktəˌɡɑn/
noun
(geometry) a polygon consisting of eight straight sides and eight angles
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nonagon
/nˌɑːnˈæɡɑːn/
noun
(geometry) a flat shape consisting of nine straight sides and nine angles
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decagon
/dᵻkˈæɡɑːn/
noun
(geometry) a flat polygon with ten straight sides and ten angles
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hendecagon
/hˈɛndɪkəɡˌɑːn/
noun
(geometry) a flat figure consisting of eleven straight sides and eleven angles
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dodecagon
/doʊdˈɛkəɡˌɑːn/
noun
(geometry) a flat figure that consists of twelve sides and twelve angles
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tridecagon
/tɹˈaɪdɪkəɡˌɑːn/
noun
a polygon with thirteen sides and thirteen angles
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tetradecagon
/tˈɛtɹeɪdkəɡˌɑːn/
noun
a polygon with fourteen sides and fourteen angles
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pentadecagon
/pˈɛnteɪdkəɡˌɑːn/
noun
a polygon with fifteen sides and fifteen angles
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hexadecagon
/hˈɛksɐdˌɛkəɡˌɑːn/
noun
a polygon with sixteen sides and sixteen angles
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heptadecagon
/hˈɛpteɪdkəɡˌɑːn/
noun
a polygon with seventeen sides and seventeen angles
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octadecagon
/ˈɑːkteɪdkəɡˌɑːn/
noun
a polygon with eighteen sides and eighteen angles
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enneadecagon
/ɛnˈiːdɪkəɡˌɑːn/
noun
a polygon with nineteen sides and nineteen angles
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icosagon
/ˈaɪkəsəɡˌɑːn/
noun
a polygon with twenty sides and twenty angles
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pentagram
/pˈɛntɐɡɹˌæm/
noun
a five-pointed star
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hexagram
/hˈɛksɐɡɹˌæm/
noun
(geometry) a flat star-shaped figure with six points that can be formed by making equilateral triangles on each side of a regular hexagon
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