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# Geometry Ch 10/11

TermDefinition
image The new figure that is produced in a transformation
preimage The original figure in a transformation
isometry A transformation that preserves length and angle measure
vector A quantity that has both direction and magnitude
component form The form of a vector that combines (horizontal,vertical) components
matrix A rectangular arrangement of numbers in rows and columns
element A number in a matrix
dimensions The numbers of rows and columns in a matrix
line of reflection Creates a mirror image of the original figure
center of rotation A fixed point used to turn a figure in rotation
angle of rotation The angles made by rays formed from the center of rotation to the image
glide reflection A transformation where every point moves and then reflects across a line
composition of transformations The result when two or more transformations are combined to produce a single transformation
line symmetry A figure in the plane can be mapped onto itself by a reflection in a line
rotational symmetry A figure can be mapped onto itself by a rotation of 180 degrees or less around the center of symmetry
scalar multiplication The process of multiplying each element of a matrix by a real number, or scalar
circle The set of all points in a plane that are equidistant from a given point
center The point in the center of the circle
radius A segment whose endpoints are the center of the circle and a point in a circle
diameter A chord that passes through the center of a circle
chord A segment whose endpoints are on a circle
secant A line/segment/ray that intersects a circle in two points
tangent A line/segment/ray that intersects the circle in exactly one point, the point of tangency
central angle An angle whose vertex is in the center of a circle
minor arc Part of a circle that measures less than 180 degrees
major arc Part of a circle that measures between 180 degrees and 360 degrees
semicircle An arc with endpoints that are the end of a diameter of a circle
congruent circles Two circles that have the same radius
congruent arcs Two arcs that have the same measure and are arcs of the same circle or congruent circles
inscribed angle An angle whose vertex is on a circle and whose sides contain chords of the circle
intercepted arc The arc that lies in the interior of an inscribed angle and has endpoints on the angle
standard equation of a circle The center (a,b) and radius r is (x-a)^2+(y-b)^2=r^2
Created by: calistaB