27 terms

coordinate plane

a plane formed by the intersection of a horizontal number line called the x-axis and a vertical number line called the y-axis

ordered pair

a pair of numbers that can be used to locate a point on a coordinate plane

quadrants

the x- and y- axes divide the coordinate plane into four regions; each region is called a quadrant

x-axis

the horizontal axis on a coordinate plane

y-axis

the vertical axis on a coordinate plane

area

the number of square units needed to cover a surface

perimeter

the distance around the outside of a figure

plane

a flat surface that extends forever

polygon

a closed plane figure formed by 3 or more line segments that intersect only at their endpoints

image

a figure resulting from a transformation

pre-image

a figure before a transformation occur

transformation

a change in the size or position of a figure

translation

a movement (slide) of a figure along a straight line

reflection

a transformation of a figure that flips the figure across a line

clockwise

the figure moves the same direction as a clock moves

counterclockwise

the figure moves the opposite direction as a clock

origin

the point where the x-axis and y-axis intersect on the coordinate plane

rotate 180 degrees

the figure turns two quadrants

rotate 270 degrees

the figure turns three quadrants

rotate 90 degrees

the figure turns one quadrant

rotation

a transformation in which a figure is turned about a point

line of reflection

a line that a figure is flipped across to create a mirror image of the original figure

line of reflection

a line that a figure is flipped across to create a mirror image of the original figure

center of rotation

The point about which a figure is rotated

intersecting lines

lines that cross at exactly one point

parallel lines

lines in a plane that do not intersect

perpendicular lines

lines that intersect to form right angles