exterior angle
(ˈɔr ɪ ti, -ˈɒr-)
Random House Webster's College Dictionary
an angle formed outside a polygon by one side and an extension of an adjacent side; the supplement of an interior angle of the polygon.
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isagon
Webster Dictionary
a figure or polygon whose angles are equal
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nonagon
Webster Dictionary
a figure or polygon having nine sides and nine angles
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apothem
Webster Dictionary
the perpendicular from the center to one of the sides of a regular polygon
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enneagon
Webster Dictionary
a polygon or plane figure with nine sides and nine angles; a nonagon
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base
Webster Dictionary
the exterior side of the polygon, or that imaginary line which connects the salient angles of two adjacent bastions
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poly-
Webster Dictionary
a combining form or prefix from Gr. poly`s, many; as, polygon, a figure of many angles; polyatomic, having many atoms; polychord, polyconic
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quadrilateral
(ˌkwɒd rəˈlæt ər əl)
Random House Webster's College Dictionary
a polygon with four sides.
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hexagon
(ˈhɛk səˌgɒn, -gən)
Random House Webster's College Dictionary
a polygon having six angles and six sides.
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nonagon
(ˈnɒn əˌgɒn)
Random House Webster's College Dictionary
a polygon having nine angles and nine sides.
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octagon
(ˈɒk təˌgɒn, -gən)
Random House Webster's College Dictionary
a polygon having eight angles and eight sides.
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heptagon
(ˈhɛp təˌgɒn)
Random House Webster's College Dictionary
a polygon having seven angles and seven sides.
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pentagon
(ˈpɛn təˌgɒn)
Random House Webster's College Dictionary
a polygon having five angles and five sides.
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dodecagon
(ʊˈdɛk əˌgɒn, -gən)
Random House Webster's College Dictionary
a polygon having 12 angles and 12 sides.
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decagon
(ˈdɛk əˌgɒn)
Random House Webster's College Dictionary
a polygon having ten angles and ten sides.
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isogon
(ˈaɪ səˌgɒn)
Random House Webster's College Dictionary
a polygon having all angles equal.
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convex
(ənˈvɜr təˌpleɪn)
Random House Webster's College Dictionary
(of a polygon) having all interior angles less than or equal to 180°.
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concave
(ɒnˈkæt nˌeɪt, kən-)
Random House Webster's College Dictionary
(of a polygon) having at least one interior angle greater than 180°.
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regular
(ˈrɛg yə lər)
Random House Webster's College Dictionary
(of a polygon) having all sides and angles equal.
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interior angle
(ˈɔr ɪ ti, -ˈɒr-)
Random House Webster's College Dictionary
an angle formed within a polygon by two adjacent sides.
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apothem
(ˈæp əˌθɛm)
Random House Webster's College Dictionary
a perpendicular from the center of a regular polygon to one of its sides.
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tetragon
(ˈtɛ trəˌgɒn)
Random House Webster's College Dictionary
a polygon having four angles or sides; a quadrangle or quadrilateral.
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diagonal
(ɪˈæg ə nl, -ˈæg nl)
Random House Webster's College Dictionary
connecting two nonadjacent angles or vertices of a polygon or polyhedron:
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dodecagon
Webster Dictionary
a figure or polygon bounded by twelve sides and containing twelve angles
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equilateral
Webster Dictionary
having all the sides equal; as, an equilateral triangle; an equilateral polygon
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tetragon
(quadrilateral, quadrangle, tetragon)
Princeton's WordNet
a four-sided polygon
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octagon
(octagon)
Princeton's WordNet
an eight-sided polygon
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heptagon
(heptagon)
Princeton's WordNet
a seven-sided polygon
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hexagon
(hexagon)
Princeton's WordNet
a six-sided polygon
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triangle
(triangle, trigon, trilateral)
Princeton's WordNet
a three-sided polygon
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