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# Geometry Chapter 6

### McDougal Littell Vocab.

A plane figure that meets the following two conditions. (1) It is formed be three or more segments colled sides, such that no two sides with a common endpoint are collinear. (2) Each side intersects exactly two other sides, one at each endpoint. polygon
Three of more segmens, no two sides with a common endpoint are collinear. sides of a polygon
Each endpoint of a side of a polygon. vertex of a polygon
A polygon such that no line containing a side of the polygon contains a point in the interior of the polygon. convex polygon
A polygon such that a line containing a side of the polygon contains a point in the interior of the polygon. concave polygon
A polygon with all of its sides congruent. equilateral polygon
A polygon with all of its interior angles congruent. equiangular polygon
A polygon that is equilateral and equiangular. regular polygon
A segment that joins two nonconsecutive vertices of a polygon. diagonal of a polygon
A quadrilateral with both pairs of opposite sides parallel. parallelogram
A parallelogram with four congruent sides. rhombus
A parallelogram with four right angles. rectangle
A parallelogram with four congruent sides and four right angles. square
A quadrilateral with exactly one pair of parallel sides, called bases. trapezoid
Quadrilateral with exactly one pair of parallel sides. bases of a trapezoid
The two angles that contain the base of an isosceles triangle. base angles of trapezoid
Nonparallel sides of a trapezoid. legs of a trapezoid
A trapezoid with congruent legs. isosceles trapezoid
A segment that connects the midpoints of the legs of a trapezoid. midsegment of a trapezoid
A quadrilateral that has ttwo pairs of consecutive congruent sides, but in which opposite sides are not congruent. kite
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