Posted by Brandon on Monday, March 5, 2012 at 1:27pm.
The coordinates of the vertices of triangle CDE are C(1,4), D(3,6), and E(7,4). If the triangle is reflected over the line y=3, what are the coordinates of the image of D?
I think (3,6), but not real sure.

geometry  Steve, Monday, March 5, 2012 at 2:36pm
think of folding the diagram on the line y=3. xvalues don't change, and yvalues are moved the same distance from the line y=3.
The distance of (x,y) from (x,3) is y3.
so, (x,y) > (x,3(y3)) = (x,6y)
(3,6) > (3,0)
D is 3 units above the line y=3, so it moves to 3 units below the line, or y=0.

geometry  lulabye, Wednesday, February 18, 2015 at 10:44am
dats correct O: howd you know <3

geometry  ensy, Friday, February 3, 2017 at 10:02am
If triangle ABC is reflected across the yaxis, what are the coordinates of A'?
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