Advertisement Upgrade to remove ads

Math vocabulary


a geometric element that has position but no extension


a straight path that extends without end in opposite directions


points that lie on the same line

non collinear

points that do not lie on the same line


extend or spread outward from a center or focus or inward towards a center

end point

The point at the segment or ray


part of a line


an unbounded two-dimensional shape

parallel lines

coplanar lines that do not intersect

intersecting lines

lines that cross at one point

perpendicular lines

Lines that intersect to form right angles

skew lines

lines that lie in different planes. they are neither parallel or intersecting


a point that divides a segment into two congruent segments

congruent segments

Segments that have the same length


two rays with a common endpoint


The common endpoint of an angle


drafting instrument used to draw or measure angles


used to measure temperature, latitude, longitude, right ascsension, and declination

congruent angles

Angles that have the same measure

right angles

angles that measure 90 degrees

obtuse angles

angles more than 90 degrees

acute angles

angles that are less than 90 degrees

complementary angles

Two angles whose sum is 90 degrees

supplementary angles

Two angles whose sum is 180 degrees

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

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.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording