Identify the coordinates of point A after a 180° rotation about the origin.
http://i57.tinypic.com/2cgdcpk.jpg

Question

Identify the coordinates of point A after a 180° rotation about the origin. 
http://i57.tinypic.com/2cgdcpk.jpg

kohai · Answer

If it's rotated 180 degrees, it's going to be reflected essentially. Do you know how to do that?

anonymous · Answer

Yes, is the answer A’ = (–2, –1) ?

anonymous · Answer

someone please help??

kohai · Answer

Relax, relaaaax, let me take another look :)

kohai · Answer

So if you want to reflect something, you're going to do it like this

kohai · Answer

If B is one unit above the origin, you have to move it one unit below the origin. You do that for all of them. This is what it will look like rotated 180 degrees

anonymous · Answer

That helped, thank you!! I have another question, can you help me with that one too?

kohai · Answer

Sure, I can

kohai · Answer

Did you choose the right answer choice?

anonymous · Answer

I did )

anonymous · Answer

Pentagon JKLMN was translated as shown. Point P is in the interior of the pre-image while its corresponding point P' is in the translated image. Which of the following statements is true about this translation?

kohai · Answer

Okay awesome :)

kohai · Answer

Can you post the statements?

anonymous · Answer

oops, forgot to add the statements:

a) PM = P'M' is the only true statement.

b) PP' = KK' is the only true statement.

d) PP' is parallel to LL' and that statement is the only true one.

d) All of the above statements are true.

kohai · Answer

Okay. Well, let's go down the choices

kohai · Answer

A) These two look like the same, so we'll keep it open 
B) PP' is not equal to KK' because P' is in the middle etc 
C) These aren't even close to parallel imo 
D) It can't be all of the above statements 

I would choose A personally

anonymous · Answer

A was the right answer! :)

kohai · Answer

Awesome :)