Pentagon ABCDE is shown on the coordinate plane below.

If pentagon ABCDE is rotated 180° around the origin to create pentagon A’B’C’D’E’, what is the ordered pair of point D’?

(-1, 2)

(2, 1)

(1, -2)

(-2, -1)

Question

Pentagon ABCDE is shown on the coordinate plane below.

 

If pentagon ABCDE is rotated 180° around the origin to create pentagon A’B’C’D’E’, what is the ordered pair of point D’? 

 (-1, 2) 

 (2, 1) 

 (1, -2) 

 (-2, -1)

anonymous · Answer

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anonymous · Answer

@Calcmathlete .. help please?

anonymous · Answer

Meh...I stink at rotations...although I do know how to do this one, I don't know how to explain it.. @ganeshie8 care to try explaining it?

ganeshie8 · Answer

me too... i get dyslexic with rotations :/

@Calcmathlete , correct me if its wrong :
An ordered pair (x, y) becomes (-x, -y) after 180 degree rotation
so the ordered pair (1, -2) becomes (-1, 2)

anonymous · Answer

I believe so. I don't do it that way. I keep track of distances in relation to rotation...kind of like a mental distance rotation. I believe that is the answer though.

anonymous · Answer

yeah thats right :D thankyou soo much

ganeshie8 · Answer

np :)

anonymous · Answer

Same here :)