Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Geo Vocab

Geometry Vocaulary

line a set of points that continue in both directions without end
line segment part of a line with two endpoints
ray part of a line that has one endpoint and continues in the other direction without end
point an exact location in space; has no size
parallel lines lines that never intersect
intersecting lines lines that cross
perpendicular lines lines that intersect at 90 degree angles
angle 2 rays with a common endpoint
acute angle an angle that is less than 90 degrees
right angle an angle that is exactly 90 degrees
straight angle an angle that measures 180 degrees
360 degrees the number of degrees in a circle
obtuse angle an angle that measures greater than 90 degrees but less than 180 degrees
circle a set of points that are equidistant (the same distance) from a common point called the center; named by its center point
chord a line segment in a circle with both endpoints on the circle
diameter a line segment in the circle with both endpoints on the circle, and it passes through the center
radius (radii - plural) a line segment in a circle with one endpoint on the circle and one endpoint on the center (1/2 the diameter)
polygon a closed figure made of line segments that do not intersect
triangle three-sided polygon
obtuse triangle triangle with 1 obtuse angles and 2 acute angles
acute triangle triangle with 3 acute angles
right triangle triangle with 1 right angle and 2 acute angles
equilateral triangle triangle with 3 congruent sides
congruent exact same size and shape
scalene triangle triangle with no congruent sides
isosceles triangle triangle with at least 2 congruent sides
quadrilateral four-sided polygon
parallelogram a quadrilateral with 2 pairs of parallel sides
rhombus a parallelogram with 4 congruent sides
rectangle a parallelogram with 4 right angles
square a parallelogram with 4 congruent sides and 4 right angles
trapezoid a quadrilateral with only one pair of parallel sides
Created by: dgiordano