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31 Cards in this Set
- Front
- Back
a closed plane figure formed by three or more line segments called sides
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polygon
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no two sides with a common endpoint are collinear
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polygon
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came from the Greek words poly and gon which mean many and angles
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polygon
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means many and angles
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poly and gon
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3 sides
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triangle
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4 sides
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quadrilateral
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5 sides
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pentagon
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6 sides
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hexagon
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7 sides
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heptagon
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8 sides
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octagon
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9 sides
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nonagon
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10 sides
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decagon
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11 sides
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undecagon
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12 sides
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dodecagon
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13 sides
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tridecagon
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14 sides
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tetradecagon
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15 sides
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pentadecagon
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16 sides
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hexadecagon
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17 sides
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heptadecagon
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18 sides
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octadecagon
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19 sides
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nonadecagon
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20 sides
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icosagon
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a polygon is _____ if all the diagonals of the polygon are in the interior of the polygon
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CONVEX
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a polygon is _____ if one (or more) of its diagonal is located in the exterior of the polygon
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CONCAVE
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both equilateral & equiangular
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Regular
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all angles are congruent
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Equiangular
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all sides are congruent
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Equilateral
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sum of the interior angles of a polygon
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SI
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sum of the exterior angles of a polygon
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SE
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measure of each interior angle of a regular polygon
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IR
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measure of each exterior angle of a regular polygon
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ER
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