Homework Help: math

Posted by robert on Saturday, December 1, 2007 at 10:49pm.

After a triangle is rotated 180 degrees, its vertices are at (-4,1),(-1,4), and (-5,-8). What were the coordinates of the vertices before the rotation?

I think the answer is (1,-4), (4,-1),(8,-5). In rotation, the coordinates get switched. All I just did was switch the numbers and signs. Is this right?

math - Reiny, Saturday, December 1, 2007 at 11:59pm
do you want your rotation about the origin?
If so, then the line joining a point and its image point should pass through the origin, yours don't.

if you interchange the x and y coordinates you are forming a reflection in the line y=x

try switching the signs only and plotting the points.
You should have tried plotting right away.

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