Posted by Tracy on Wednesday, January 28, 2009 at 11:46pm.
A triangle has vertices P(a,b), Q(c,d), and R(e,f). You are asked to prove that the image triangle angle P'Q'R' of triangle angle PQR after reflection across the yaxis is congruent to the preimage. What coordinates should you use for the vertices of triangle measurements P'Q'R?
Sorry, it's long! I'm confuse by this question... Please help!

Math Geometry  Anonymous, Monday, July 28, 2014 at 2:38pm
The vertices of triangle DEF are D (5,3), E (4,3), and F (4,8).
What is the area, in square units, of triangle DEF?
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