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### 39 Cards in this Set

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 polygon A plane figure formed by coplanar segments such that 1. each segment intersects exactly two other segments, one at each endpoint; and 2. no two segments with a common endpoint are collinear. sides of a polygon has to be 3 or more vertex the endpoint of a side convex the sides don't end non-convex, concave a non convex equilateral polygon all the sides are congruent equiangular polygon all the interior angles are congruent regular polygon A polygon that is both equiangular and equilateral. diagonal of a polygon a segment that joins two nonconsecutive vertices parallelogram A quadrilateral with both pairs of opposite sides parallel. rhombus A quadrilateral with four congruent sides. rectangle A quadrilateral with four right angles. square A quadrilateral with four right angles and four congruent sides. trapezoid A quadrilateral with exactly one pair of parallel sides, called bases. The other sides are legs. bases of a trapezoid the parallel sides base angles of a trapezoid two pairs of angles whose common side is the base of a trapezoid legs of a trapezoid the nonparallel sides isosceles trapezoid A trapezoid with congruent legs. mid-segment of a trapezoid a segment that connects the midpoints of two sides of a triangle kite A quadrilateral that has two pairs of congruent sides, but opposite sides are not congruent. image the new figure that results from the transformation of a figure in a plane preimage the original figure in the transformation of figure in a plane transformation the operation that maps or moves a preimage onto an image isometry A transformation that maps every segment to a congruent segment. Also called a congruence mapping. reflection a type of transformation that uses a line that acts like a mirror, called the line of reflection, with an image reflected in the line line of reflection acts like a mirror line of symmetry a line that a figure in the plane has if the figure can be mapped out onto itself nu a reflection in the line rotation a type of transformation in which a figure is turned about a fixed point called the center of rotation center of rotation a fixed point angle of rotation the angle formed when rays are from the center of rotation to a point and its image. rotational symmetry a figure in the plane has rotational symmetry if the figure can be mapped onto itself by a rotation of 180 or less translation a type of transformation vector a quantity that has both direction and magnitude and is represented by an arrow drawn between two points initial point starting point terminal point ending point component form the form of a vector that combines the horizontal and vertical components of the vector glide reflection a type of reflection composition the result when two or more transformations are combined to produce a single transformation frieze pattern or border pattern a pattern that extends to the left and right in such a way that the pattern can be mapped onto itself by a horizontal translation