Question

How do you find lines of reflection?

Answer 1

So basically what I'm wondering is how to find the lines of reflection for a translation and a rotation. For example, if a question asks you to find two lines of reflection to get triangle ABC to triangle A'B'C' how would you do it?

Answer 2

http://www.regentsprep.org/Regents/math/geometry/GT1/reflect.htm

Hope it helps

Answer 3

I was reading that earlier but it only tells you how to find one line of reflection. I need to know how to find two or more :s

Answer 4

ohh okay one sec

Answer 5

http://www.virtualnerd.com/middle-math/integers-coordinate-plane/transformations/line-of-reflection-definition

How bout that?

Answer 6

All those examples only included one line of reflection, and it didn't explain how to get it (although I know how to find one). I'm just not sure on how to find two

Answer 7

ohh okay give me one more chance

Answer 8

http://www.mathwarehouse.com/transformations/reflections-theorem.php

ANd this one?

Answer 9

I know how to find the image of reflecting lines, but I don't know how to find the reflecting lines for a given image. I know that you need to use a mira. It's alright if don't know how lol

Answer 10

lol i give up

Answer 11

reflecting lines are midpoints basically; but since we dont really know what abc abd a'b'c' it might be hard to generalize

Answer 12

the draw button seems to be broken at the moment :/

Answer 13

Well for example how would you find two lines of reflection so triangle DCE is reflected onto D'C'E? I know that you can do it with one reflection but I need to know how to find two or more lines

Answer 14

http://jwilson.coe.uga.edu/EMT668/EMAT6680.2000/Obara/Emat6690/Transformation/image9.gif

Answer 15

1 reflections provides a mirror image, 2 reflections produces a "normal" image. So if you were trying to accomplish this certain task with this, there is no way you can reflect 2 times and end up with D'C'E' that i can see

Answer 16

3 lines of reflection* sorry I just got a random image from the internet

Answer 17

hmm, im thinking there are at least 2 ways to approach it. But without the draw button working ill have to work some pencil paper ideas to flesh it out

Answer 18

Thanks

Answer 19

of got 1 solution, and there are most likely more

Answer 20

find the "midline" between some like points D and D' seems good.

the idea is to simply reflect the original to relatively the same spot, and then use that position to flip it gain at the common point

Answer 21

as this idea goes,

find the perp midline between the "same" parts; this gets you to the point where all you have to do is reflect it again using the "same" part and the midpoint between 2 other "same parts" to from the line of reflection

Answer 22

Thanks, I think I get it now. That pretty much summed up how to find lines of symmetry for both reflectional and rotational symmetry. I really appreciate the help!

Answer 23

your welcome