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# Polygons

### Different types of polygons

TermDefinition
Polygon A many sided closed figure named according to the number of angles and sides they have- Greek word "poly" means many; Greek word "gon" means angles
Equilateral Polygon All sides are congruent
Equiangular Polygon All sides are congruent
Regular Polygon All sides and all angles are congruent
Vertices Endpoints of the sides of a polygon
Diagonal Line segment connecting two nonadjacent vertices in a polygon
Convex Polygon No diagonals contains points outside the polygon; no angle greater than 180°; a line crosses at most two sides.
Concave Polygon Lines can be drawn outside the polygon; at least one interior angle is greater than 180°(reflex angle); at least one line can be drawn across more than two sides
Quadrilateral Four side, four angles, and four vertices
Parallelogram Quadrilateral with both pairs of opposite sides parellel and congruent
Rhombus Parallelogram with four congruent sides
Rectangle Parallelogram with four right angles
Square Parallelogram with four congruent sides and four right angles
Kite Quadrilateral with two pair adjacent sides congruent and no opposite sides congruent
Trapezoid Quadrilateral with exactly one pair of parallel sides
Isosceles Trapezoid Trapezoid whose nonparallel sides are congruent
Right Trapezoid Trapezoid with two right angles
Pentagon Five sided polygon, five angles, five vertices
Hexagon Six sided polygon, six angles, six vertices
Heptagon Seven sided polygon, seven angles, seven vertices
Octagon Eight sided polygon, eight angles, eight vertices
Nonagon Nine sided polygon, nine angles, nine vertices
Decagon Ten sided polygon, ten angles, ten vertices
Dodecagon Twelve sides, twelve angles, twelve vertices
n-gon n sides, n angles, n vertices
Created by: Joanne02468