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