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Colors and Shapes - Polygons

Read this lesson to learn the names of polygons in English, such as "convex polygon", "heptagon" and "hendecagon".

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Words Related to Colors and Shapes
regular polygon

a two-dimensional closed shape with straight sides and equal angles between adjacent sides, and all sides have the same length

[noun]
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Definition & Meaning of \"regular polygon\"
irregular polygon

a polygon that does not have all sides or angles equal in size or measure, making it non-regular and lacking symmetry

[noun]
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Definition & Meaning of \"irregular polygon\"
convex polygon

a geometric shape that has all its interior angles measuring less than 180 degrees, causing the polygon to curve outward

[noun]
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Definition & Meaning of \"convex polygon\"
concave polygon

a geometric shape that has at least one angle measuring greater than 180 degrees, causing the polygon to curve inward

[noun]
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Definition & Meaning of \"concave polygon\"
quadrilateral

(geometry) a flat figure with four straight sides and four angles

[noun]
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Definition & Meaning of \"quadrilateral\"
pentagon

a geometric shape with five angles and five straight sides

[noun]
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Definition & Meaning of \"pentagon\"
hexagon

(geometry) a closed shape with six straight sides and six angles

[noun]
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Definition & Meaning of \"hexagon\"
heptagon

a seven-sided plane shape consisting of seven line segments or edges that meet at seven interior angles

[noun]
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Definition & Meaning of \"heptagon\"
octagon

(geometry) a polygon consisting of eight straight sides and eight angles

[noun]
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Definition & Meaning of \"octagon\"
nonagon

(geometry) a flat shape consisting of nine straight sides and nine angles

[noun]
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Definition & Meaning of \"nonagon\"
decagon

(geometry) a flat polygon with ten straight sides and ten angles

[noun]
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Definition & Meaning of \"decagon\"
hendecagon

(geometry) a flat figure consisting of eleven straight sides and eleven angles

[noun]
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Definition & Meaning of \"hendecagon\"
dodecagon

(geometry) a flat figure that consists of twelve sides and twelve angles

[noun]
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Definition & Meaning of \"dodecagon\"
tetradecagon

a polygon with fourteen sides and fourteen angles

[noun]
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Definition & Meaning of \"tetradecagon\"
tridecagon

a polygon with thirteen sides and thirteen angles

[noun]
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Definition & Meaning of \"tridecagon\"
pentadecagon

a polygon with fifteen sides and fifteen angles

[noun]
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Definition & Meaning of \"pentadecagon\"
hexadecagon

a polygon with sixteen sides and sixteen angles

[noun]
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Definition & Meaning of \"hexadecagon\"
heptadecagon

a polygon with seventeen sides and seventeen angles

[noun]
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Definition & Meaning of \"heptadecagon\"
octadecagon

a polygon with eighteen sides and eighteen angles

[noun]
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Definition & Meaning of \"octadecagon\"
enneadecagon

a polygon with nineteen sides and nineteen angles

[noun]
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Definition & Meaning of \"enneadecagon\"
icosagon

a polygon with twenty sides and twenty angles

[noun]
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Definition & Meaning of \"icosagon\"
pentagram

a five-pointed star

[noun]
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Definition & Meaning of \"pentagram\"
hexagram

(geometry) a flat star-shaped figure with six points that can be formed by making equilateral triangles on each side of a regular hexagon

[noun]
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Definition & Meaning of \"hexagram\"
trilateral

a three-sided geometric shape

[noun]
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Definition & Meaning of \"trilateral\"
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