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)

Answer 1

@Calcmathlete .. help please?

Answer 2

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?

Answer 3

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)

Answer 4

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.

Answer 5

yeah thats right :D thankyou soo much

Answer 6

np :)

Answer 7

Same here :)