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coordinate plane

A plan 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

Four regions into which a coordinate plane is divided by the x-axis and the y-axis

x-axis

The horizontal axis on a coordinate plane.

y-axis

The vertical axis on a coordinate plane.

area

the surface; Length x Width

perimeter

The distance around a geometric figure.

plane

A flat surface.

polygon

a closed figure made by joining line segments where each line segment intersects exactly 2 others

image

the resulting figure AFTER a transformation is performed on it

Pre-image

the original figure BEFORE a transformation is performed on it

Transformation

a movement on the cartesian plane

translation

It is a transformation that moves points the distance and in the same direction.

reflection

It is a transformation that flips a figure over a line of reflection.

Clockwise

the figure moves the same direction as a clock moves

Counterclockwise

the figure moves the opposite direction as a clock

origin

The centre point of a number line (ground floor of a hotel, freezing point on a thermometer)

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

It is a transformation that turns a figure about a fixed point.

line of reflection

The line over which a figure is reflected. The vertices of the original and new figure are the same distance from this. The line of reflection can be the x-axis, the y-axis, or any line on the coordinate plane.

Center of Rotation

point around which a figure rotates

Intersecting lines

Two or more lines that meet at a common point.

parallel lines

2 lines that never cross/intersect and stay the same distance apart

Perpendicular lines

lines in a plane that intersect to form 4 right angles