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Math Geometry

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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 -

    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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