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 y-axis 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?

## Answer this Question

## Related Questions

- geometry - If you had two triangles, triangle RST and triangle UVW, and in ...
- algebra - The vertices's of triangle ABC are A(-1,2), b(0,3), and c(3,1). ...
- Geometry - Determine whether triangle PQR is congruent to triangle STU given the...
- geometry - solve this proof: PR is congruent to DE, PT is congruent to DF, Angle...
- Help with triangle - I need help with these: Triangle LMN has vertices L(-6,5), ...
- geometry - I am really stuck on a couple of these. 2 column proof Given: FH is ...
- Math - If triangle MNO is congruent to triangle PQR, which of the following can ...
- Honors Geometry - In a proof, I am given that Triangle GCF is congruent to ...
- geometry - can one tell if two triangles are congruent if they are given only ...
- geometry - I need to figure out this proof, the figure is two triangles forming ...