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)

4 answers

use the distance formula many times to find the lengths of the sides.

The two triangles with all congruent sides are congruent (SSS).
What is the distance formula?
http://www.google.com/#q=distance+formula
lol no brainer XD
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