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31 Cards in this Set

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