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39 Cards in this Set
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 Back
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


nonconvex, 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.


midsegment 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
