Posted by **Trey** on Tuesday, February 23, 2010 at 7:21am.

Determine wether triangle deef is cogruent to triangle pqr given the coordinates of the verticles. D(-6,1),E(-1,-4),P(0,5),Q(7,6),R(5,0)

- missing information -
**MathMate**, Tuesday, February 23, 2010 at 8:41am
The length of DE equals the length of PR, which means that congruence is not impossible.

However, the coordinates of F is missing, so it is not possible to determine if DEF is congruent to PQR.

- geometry -
**dongo**, Tuesday, February 23, 2010 at 12:03pm
Well, by a simple vector calculation in the plane, you can easily find the last verticle. However, I interpret the question just as MathMate did.

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