MEDAL & FAN ANYBODY ?
To rotate a figure 180 degrees about the origin, which of the following must happen?
a. Switch the coordinates and multiply both by –1
b. Multiply both coordinates of each point by –1
c. Switch the coordinates and multiply the first coordinate by –1
d. Multiply the first coordinate by –1

Question

MEDAL & FAN ANYBODY ?
To rotate a figure 180 degrees about the origin, which of the following must happen?
a. Switch the coordinates and multiply both by –1
b. Multiply both coordinates of each point by –1
c. Switch the coordinates and multiply the first coordinate by –1
d. Multiply the first coordinate by –1

nerdgirl · Answer

Let me know if this helps! :) https://answers.yahoo.com/question/index?qid=20111204184108AAsfzz4

mathmate · Answer

Hint:
$R_{180}: (x,y) \rightarrow (-x, -y)$

nerdgirl · Answer

Short answer - it's B