The easiest way to get started
Quiz yourself by typing answers
Hear the words and type them in
Multiple choice, true/false, matching
Match terms as fast as you can
Defend Earth from alien invaders
An angle less than 90 degrees but more than 0 degrees
Angles that have a common side and a common vertex (corner point).
Either of the two number lines used to form a coordinate grid.
To divide into two equal parts
Circles that lie in the same plane and have the same center
Having the same size and shape
Two angles in a polygon with a common side
a pair of numbers used to determine the position of a point on a graph
Angles or lines of 2 different polygons that are in the same position
a visual representation (of an object or scene or person or abstraction) produced on a surface
a circle (on the inside) of a polygon and only touches each side at exactly 1 point
a transformation or combination of transformations which results in the image being exactly the same shape and size as the pre-image
Line of Reflection
A line that a figure is flipped across to create a mirror image of the original figure
a point that divides a segment into two congruent segments
An angle that measures more than 90 degrees but less than 180 degrees
Ordered Number Pair
A pair of numbers used to locate a point on a coordinate grid. The fist number corresponds to a position along the horizontal axis (x), and the second number corresponds to a position along the vertical axis (y).
the point (0,0) where the x-axis and the y-axis intersect in a coordinate plane
Parallel Line Segments
Line segements that never intersect (they are always the same distance apart)
lines in the same plane that never intersect
intersecting at or forming right angles
A line that is perpendicular to a segment at its midpoint.
the image before the transformation occurs
Rectangular Coordinate Grid
A device for locating points in a plane using ordered pairs or coordinates
A transformation that produces the mirror image of a figure.
an angle that is more than 180 degrees but less than 360 degrees
the 90 degree angle between two perpendicular lines
A movement of a figure that turns that figure around a fixed point.
Imperfect type of sketch used to plan drawing
a plane figure bounded by two radii and the included arc of a circle (this resembles a slice of pizza)
two lines that do NOT lie in the same plane, are not parallel, and do not intersect
an angle of 180 degrees
When the sum of the measures of a pair of angles add up to 180°
A function that changes the position or direction of the axes of a coordinate system
A movement of a figure to a new position without turning or flipping it.
a line that intersects two or more lines
The common endpoint of an angle
Vertical (opposite) Angle
when two lines intersect, the angles that do not share a common side (vertical angles have equal measures)
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions above and try again
Reload the page to try again!
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Your microphone is muted
For help fixing this issue, see