geometry
posted by Trey .
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)

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. 
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.