Question

Geo help

Answer 1

sorry, i don't know how to do it..
but this might help: http://openstudy.com/study#/updates/50ec5ed0e4b07cd2b648eece

@Hero @Luigi0210 @Luigi0210 please help

Answer 2

Why not ask in the math section where people who know about the composition of transformations might see it?

Answer 3

I didn't mean to post it on the main page, honestly.

Answer 4

I'm pretty sure I know which one it is.

Answer 5

I believe it's a because it's twice the size of the original, and I know it's not b.

Answer 6

But, I'm not sure.

Answer 7

http://www.regentsprep.org/Regents/math/geometry/GT6/composition.htm
and
http://www.regentsprep.org/Regents/math/geometry/GT5/properties.htm
will cover the basics.

Answer 8

@Hero Can you explain it to me?

Answer 9

Well, I thought it was b, but maybe I'm misinterpreting what D_2 means

Answer 10

I thought it was B, as well. But, it said that was wrong.

Answer 11

I know it's not B or C. What would be your guess? @Hero

Answer 12

How do you know it's not B?

Answer 13

What does D_2 mean? I figure a dilation of 2 means enlargement by 2

Answer 14

That's what I first answered, and got it wrong.

Answer 15

You're right.

Answer 16

I see. Well, if it's not that, then..

Answer 17

I'm not really sure what it is.

Answer 18

Me neither. I will let you know.

Answer 19

@Hero It was A.

Answer 20

that's interesting. I knew it is D_2 at least.

Answer 21

I think I'm going to investigate it a bit more and figure out why.

Answer 22

Let me know what you find. I'm curious myself. I went with A because of D2.

Answer 23

@Hero

Answer 24

I'll let you know. Maybe sometime later today.

Answer 25

Yes, it is A. The composition makes them happen in reverse order. The vector \(\langle 0,-6 \rangle\) translates EFGH to (1,-1)(7,-1)(7,-5)(1,-5). Then the \(D_2\) dilates by two, making these (2,-2)(14,-2)(14,-10)(2,-10).

This is all covered on those pages I linked. I just wanted it closed and moved to the proper section before I pointed out more...