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

Geometry Terms

3rd Grade Geometry Terms

2-dimensional shapes shapes that have only 2 dimensions (width and height) but no thickness; flat shapes: plane figures
acute angle angles that are smaller than a right (90 degree) angle
attributes properties, characteristics, or qualities of an object
properties attributes, characters or qualities that something has
congruent the same size and the same shape (equal or equivalent)
polygon simple closed plane shape (2-dimensional) with all straight sides
obtuse angle angle that is larger than a right (90 degree) angle
parallel lines always the same distance apart, never touching
parallelogram a quadrilateral that has exactly two pairs of parallel sides
quadrilateral polygon with exactly 4 sides
right angle angle with exactly 90 degrees; perpendicular
square parallelogram with right angles and all sides congruent (equal)
rectangle a parallelogram with right angles
rhombi parallelogram with all congruent (equal) sides
plane figure a 2-dimensional shape
trapezoid a quadrilateral with exactly only one pair of parallel sides
Created by: MrP7