23 terms

Geometry-Polygons

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Triangles
any polygon with 3 sides and 3 angles
Quadrilateral
a four-sided polygon
Parallelogram
a quadrilateral whose opposite sides are both parallel and equal in length
Trapezoid
a quadrilateral with two parallel sides
Rectangle
a parallelogram with four right angles
Square
a plane rectangle with four equal sides and four right angles
Pentagon
a five-sided polygon
Hexagon
a six-sided polygon
Heptagon
a seven-sided polygon
Octagon
an eight-sided polygon
Nonagon
a nine-sided polygon
Decagon
a polygon with 10 sides and 10 angles
Dodecagon
a twelve-sided polygon
n-gon
a polygon with n sides
diagonals
a segment that connects a vertex to a nonadjacent vertex in a polygon
equilateral
all sides are congruent
equiangular
all angles are congruent
regular
conforming to a standard or pattern
concave
curving inward
convex
curving or bulging outward
interior/exterior angles
Interior are angles on the inside and exterior are angles on the outside
vertices
The point of intersection of two sides of a polygon. The point of intersection of three edges of a space figure.
sides
line segments that form the polygon
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