Busy. Please wait.

Forgot Password?

Don't have an account?  Sign up 

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.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.

Already a StudyStack user? Log In

Reset Password
Enter the email address associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know (0)
Know (0)
remaining cards (0)
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

Proof Justifications

Common Proof Justifications

Definition of Supplementary <'s 2 <'s are Suppl. iff they sum to 180
Definition of < Congruence m<1=m<2 iff <1 is congruent to <2
Definition of < bisector Ray BD bisects <ABC iff <ABD is congruent to <DBC
Definition of Complementary <'s 2 <'s are Comp. iff they sum to 90
Definition of Right <'s an < is right iff m=90
Definition of perpendicular 2 lines perpendicular iff they form 4 right <'s
vertical < therom if 2 <'s are vertical, then they are congruent
Right < Therom all right <'s are congruent
Supplement Therom If 2<'s form a linear pair, they are supplementary
G: <1+<2 are Suppl. <2+<3 are Suppl. P: <1 is congruent to <3 <'s suppl. to the same < are congruent
G: <1+<2 are Comp. <2+<3 are Comp. P: <1 is congruent to <3 <'s comp. to the same < are congruent
Created by: Supercute