# PAT Keyhole Inversion Question

Discussion in 'DAT Discussions' started by jetbot33, Sep 21, 2014.

1. ### jetbot33 2+ Year Member

16
2
Sep 21, 2014
I have a question about keyholes. I was taught that all that matters is the top view, right (end) and front view. If you squash those views, you will always get three 2-D images that you can rotate around 360 degrees until you get the correct aperture. Easy enough right?

But now the question is: can you, along with rotating the image, also invert it? As in take the mirror image of it? As in flip it? I'm not saying moving the 2-D squashed image AFTER you figure it out, I'm asking whether you're allowed to straight up just flip it and use the inverted image. I'm only asking this because I was taught by Crack the PAT that you can only rotate the image but never invert it.

To demonstrate what I mean, I'll link a drawing I made of the front view of an object vs its inverted (flipped) front view.

http://i.imgur.com/Z7ZL52E.jpg

Last edited: Sep 21, 2014
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3. ### Jonyjony

1
0
Jan 14, 2016
Im also wondering the same thing?! Anyone know? Thanks

4. ### jya5ab

53
22
Jun 28, 2016
Also wondering the same! Here is an example from DAT Genius's Rock Keyhole generator (DAT Rock Keyholes Free Practice). The correct answer choice is B, which as you can see from the 3-D image at the bottom, is the inverted/mirror image version of what you'd picture in your head... So on the real DAT PAT, are we expected to manipulate keyholes in this way?

5. ### joelmSDN Lifetime DonorLifetime DonorClassifieds Approved

35
40
Apr 17, 2016
Hey @jya5ab

Remember, for keyholes we can rotate the object before inserting it through the cutout. B) isn't an inversion / mirror image, the 3D object has just been rotated before inserting into the cutout.

I made up some quick screenshots which hopefully will help a bit.

6. ### jya5ab

53
22
Jun 28, 2016
I'm not sure why I thought it was inverted... After taking a 2nd look at it, I can see very clearly that it's just rotated. Thank you for that!

joelm likes this.