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

4th grade math

geometry and spatial reasoning

When two rays meet at a common endpoint, they form an ___. angle
An angle with a measure of 90 degrees. right angle
A triangle with all three angles less than 90 degrees. acute triangle
An angle with a measure greater than 0 degrees and less than 90 degrees. acute angle
An angle that measures greater than 90 degrees but less than 180 degrees. obtuse angle
A triangle with one obtuse angle. obtuse triangle
Lines that meet or cross each other to form right angles. perpendicular lines
Lines that are the same distance apart. They do not meet. parallel lines
Created by: Promethean