Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account


A straight path that goes on forever in opposite directions.

Line Label

A label that is a line with arrows on both ends.


A part of a line that has one endpoint and extends without end in one direction.

Ray Label

A label that is a line with an arrow on one end


A figure formed by two rays or line segments with two endpoints.

Angle Lable

A label that is similar to a "less than symbol" only flat on the bottom.


The same distance apart at every point.


Lines, line segments, or rays are this if they form right angles.

Oblique Lines

Lines that are not parallel or perpendicular.


A semicircular instrument for measuring and constructing angles.


A unit of measuring angles. Also a unit for measuring temperature.

Right Angle

An angle that measure 90 degrees.

Intersecting Lines

Lines that cross at the same point.


Two angles whose sum of their measures is 90 degrees.


Two angles whose sum of their meaures is 180 degrees.


Angle greater than 0 degrees and less than 90 degrees.

Right Angle

A 90 degree angle.


Angle greater than 90 degrees and less than 180 degrees.

Straight Angle

A 180 degree angle.

Reflex Angle

Angle greater than 180 degrees and less than 360 degrees.


A shape that measures 360 degrees.


Left turn


Right turn

1 turn

90 degrees.

2 turns

180 degrees.

3 turns

270 degrees.

4 turns

360 degrees.


A two-dimensional figure with four sides.


figures that are the same shape and size.


A closed plane figure with sides made of straight line segments.

Vertical Angles

A pair of opposite angles formed by intersecting lines.

Opposite Angles

These angles are formed by two intersecting lines and have the same measure.

360 degrees

The sum of the interior angles of a quadrilateral.

180 degrees

The sum of the interior angles of a triangle.

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 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

Voice Recording