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# Howard Geometry 6

### Chapter 6 Geometry Vocabulary

Triangle A polygon with three sides
Quadrilateral A polygon with four sides
Pentagon A polygon with five sides
Hexagon A polygon with six sides
Heptagon A polygon with seven sides
Octagon A polygon with eight sides
Nonagon A polygon with nine sides
Decagon A polygon with ten sides
Diagonal A segment that connects two non-adjacent vertices of a polygon
Legs The nonparallel sides of a trapezoid
Bases The parallel sides of a trapezoid
Trapezoid A quadrilateral with only one pair of parallel sides
Vertex The point where two sides of a polygon meet
Rectangle A parallelogram with four right angles
Rhombus A parallelogram with four congruent sides
Square A polygon that is both a rhombus and a rectangle
Isosceles Trapezoid A trapezoid with 2 congruent legs
Equilateral A polygon with all congruent sides
Equiangular A polygon with all congruent angles
Regular A polygon with all congruent angles and sides
Concave A polygon that is not convex; it appears to have a dent in it
Convex A polygon where no line that contains a side of the polygon that passes through the interior of the polygon
Exterior angles of a polygon or Interior angles of a quadrilateral 360 degrees
Interior angles of a triangle 180 degrees
Interior angles of any polygon (number of sides - 2) x 180
Polygon A figure that is 1) flat 2) closed 3) formed by 3 or more straight sides
Side A segment that form a polygon
Parallelogram A quadrilateral formed by two pairs of parallel sides
Midsegment A segment formed by connecting the midpoints of the legs of a trapezoid; it is parallel to the bases
Interior Angles The angles on the inside of a polygon
Exterior Angles The angles formed on the outside of a polygon by extending the sides of a polygons into rays
Base Angles Angles formed between the base and leg of a trapezoid
Created by: HowardGeometry