DAT Bootcamp PAT Question?

[juliko]

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I was trying to figure out the following TFE problem on the DAT Bootcamp PAT (it's test #1):

It says it's A, but I don't understand why it can't be B...if it were A, wouldn't there also be a dashed vertical line on the left of the top view to show the indentation in A from the hole?

Thank you!

 

[StumpMT]

Just by looking at your post I initially thought it was B. If it was A or C there would be a dashed, vertical line on the left side of the top view. If it was D the dashed line in the END VIEW would be solid. So by ruling those out it has to be B.

 

[LazyP]

Its A because of the circular side on the right, so the edge of tunnel would be noticed from the front view on the right since its meets the boundary of the circular side. hope that made sense

 

[FeralisExtremum]

I also can't see how it isn't B...like you said, the indentation from the front view on the left of A isn't shown, plus from the top view that rectangle shape on the left half wouldn't have a height change if it wasn't a piece sticking out, it would be smooth with the right half.

 

[LazyP]

this should clear it up...the blue is the piece on the right which is shown in A

 

[FeralisExtremum]

this should clear it up...the blue is the piece on the right which is shown in A

From the top view, shouldn't that little indentation be represented somehow?

 

[LazyP]

From the top view, shouldn't that little indentation be represented somehow?

Nope because from the top it is semicircle. The yellow dotted line does not exist but instead its the where the "tunnel" edges touch the circle, the tunnel still goes after that with the end having a circular form.

 

[StumpMT]

this should clear it up...the blue is the piece on the right which is shown in A

That picture and your subsequent explanation changes my mind about it. If there was a rectangular block, with an edge matching the curvature of the back, being stuck through the tunnel then it would be B. But how would you know just by looking at the initial problem if it is just a tunnel?

 

[LazyP]

That picture and your subsequent explanation changes my mind about it. If there was a rectangular block, with an edge matching the curvature of the back, being stuck through the tunnel then it would be B. But how would you know just by looking at the initial problem if it is just a tunnel?

then the dashed lines would not be there if it weren't a tunnel

 

[StumpMT]

then the dashed lines would not be there if it weren't a tunnel

I was just testing you 😀

 

[mightymoose02]

Definitely missed that one. lol

 

[juliko]

Thanks everyone! Yeah, this one definitely confused me.