How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF or ∆ABC and ∆XYZ.

Question

How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF or ∆ABC and ∆XYZ.
i found the coordinates of both sets:
QRS    Q(-2,5), R(-2,1), S(-5, 1)
DEF     D(5,-5), E(5,-2), F(2,-2)
or
ABC   A(4,5), B(6,2), C(2,2)
XYZ   X(-4,-5), Y(-6,-2), Z(-2,-2)

Steve · Answer

use the distance formula many times to find the lengths of the sides. The two triangles with all congruent sides are congruent (SSS).

Marie · Answer

What is the distance formula?

Ms. Sue · Answer

http://www.google.com/#q=distance+formula

This doesnt help · Answer

lol no brainer XD