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22 Cards in this Set

  • Front
  • Back
polygon
the union of three or more coplanar segments in which exactly two segments intersect at each endpoint
sides
segments of a polygon
vertices
endpoints of the segments
tri
3
quad
4
penta
5
hexa
6
hepta
7
octa
8
nona
9
deca
10
undeca
11
dodeca
12
how many sides does a hexagon have?
5
how many angles are there inside a nonagon?
9
what is a polygon with twelve sides called?
dodecagon
concave
has at least one diagonal that lies outside the polygon
convex
all diagonals inside the polygon
theorem 5.1
180[n-2]= sum of interior angles of a convex polygon
theorem 5.2
the sum of the measures of the exterior angles, one at each vertex, for any convex polygon is 360 degrees
theorem 5.3
every interior angle of a regular n-gon measures (180[n-2])/n
theorem 5.4
every exterior angle of a regular n-gon measures 360/n