key hole

[joonkimdds]

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In case u guys r wondering, this is from Kaplan BB p498 #11.
which circle between these two should be the top side of this structure and how do we know?

and how about this one?

I know that the answer can't be A but what's the correct answer between B and C and why?

 

[admap]

It would be the oval because the front of this box is a rectangle and you can see its an oval, not a cricle.. Also, the sides are very narrow which corresponds more to the oval than the circle...

For the second question the answer is B. C is not the correct choice, because the side of the triangle with the notch is at an angle more than 90, whereas the choice has the side which comes down at a right angle.

Don't really know how to explain it, its late and I gave it a shot! But let me know if you did not understand it, I'll try it explain it a little better.

 

[PooyaH]

For the second one I'd go with B! It's not C because choice shows a straight line, but it actually should be a little bit slanted. And if you get the back projection of it you clearly get a square. This one is really hard to explain but hope it makes sense a little bit lol

 

[klutzy1987]

First one is obviously the oval, because the shape extends left to right more than it extends fron to back.

For the second one the answer is B because there is more space between the nothch and the base. Choice C has very little space there, not enough.

 

[joonkimdds]

thanks.

 

[jdent]

For the second question i was thinking more like klutzy I dont see any slant that the rest of you are talking about.

 

[klutzy1987]

ok now I understand the 2nd one.
But I think I made a little mistake on the 1st one.
I drew it using Paint program.
the actual picture given in the kaplan BB was little bit shorter than what I drew from left to right but it was still a rectangle, not square.

so as long as it looks like an rectangle, it has to be oval? if so, Kaplan is wrong because they said it should be a complete circle than oval when both front and end views are rectangle horizontally.

If both front and end have equal,lengths, then that tells you that the object is a square or circle not rectangle or oval.

 

[Dencology]

ans. is B