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

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

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

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pentagon
[noun]

a geometric shape with five angles and five straight sides

Ex: She drew a pentagon on the chalkboard to illustrate its shape to the students .
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hexagon
[noun]

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

Ex: In geometry class , students learned how to calculate the area of a hexagon.
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heptagon
[noun]

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

Ex: One version of the game featured a board laid out in a grid of non-uniform heptagons instead of the usual squares .
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octagon
[noun]

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

Ex: The child 's drawing featured a perfectly symmetrical octagon.
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nonagon
[noun]

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

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decagon
[noun]

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

Ex: The children were challenged to draw a perfect decagon during their geometry class .
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(geometry) a flat figure consisting of eleven straight sides and eleven angles

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dodecagon
[noun]

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

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a polygon with fourteen sides and fourteen angles

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a polygon with thirteen sides and thirteen angles

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a polygon with fifteen sides and fifteen angles

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a polygon with sixteen sides and sixteen angles

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a polygon with seventeen sides and seventeen angles

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a polygon with eighteen sides and eighteen angles

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a polygon with nineteen sides and nineteen angles

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icosagon
[noun]

a polygon with twenty sides and twenty angles

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pentagram
[noun]

a five-pointed star

Ex: She drew a pentagram on the front of her notebook .
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hexagram
[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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a three-sided geometric shape

Ex: As a pattern , the designer chose a trilateral for the mosaic flooring in the lobby .
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