two angles that add up to 90 degrees
Two angles that add up to 180 degrees
Angles that have a common side and a common vertex (corner point).
A pair of opposite congruent angles formed by intersecting lines.
Angles that have the same measure
A pair of angles which are on the same side of the transversal, one must be interior, one must be exterior, and they must be nonadjacent
alternate interior angles
angles between 2 lines and on opposite sides of a transversal
alternate exterior angles
Angles that lay outside the parallel lines and are on opposite sides of the transversal; They are congruent.
A line that intersects two or more lines.
lines that never intersect
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 this FAQ.