Stuck on this TFE question

[virtualmaster999]

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Hey everyone

Could someone explain why this is A and not D? Wouldn't the square portion slant in A?

Thanks in advance!

 

[Weakfart]

Take a look at the front view again. See the line on the very front? It would eliminate D because if the "Triangle" was standing up as it is in D, the line would not be present in the front view.

 

[virtualmaster999]

Take a look at the front view again. See the line on the very front? It would eliminate D because if the "Triangle" was standing up as it is in D, the line would not be present in the front view.

Hmm I'm still not getting it. Do you have another way to look at it?


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[FeralisExtremum]

Maybe this will help. If D was the correct answer, this is an example of what the front and end views could look like:

In the top view of answer choice D, there is a vertical line running through the front piece of the figure that represents a height change taking place. This height change would have to be indicated in the front view and end view. The absence of any change in height of the front piece in the front and end views (of the original question) means that it's invalid as an answer choice. In the modified answer choice above, I've shown what it would have to look like for answer choice D to be valid.

In the original figure's front view, the front piece has a vertical line - not a horizontal one. This tells you that from the top view there is a change in depth, not height, taking place

 

[KyoPhan]

Answer D can suggest 2 scenarios.

1) That there's a stair-like object in the very front view. If this was the case, for the front view picture, we would see an L-like object instead of the rectangle with the line in the middle. In the end-view, we would also have to see a horizontal line on the very left small square.
*Edit: FeralisExtremum gave a perfect example of what it could look like.

2) Scenario 2 would be that the object in the very front is an upward-pointing triangle(looking at it from the front view perspective). An upward pointing triangle would match perfectly with the end view. However, in the front view picture, we do not see a upward triangle. Instead we see the small rectangle with the vertical line in the middle.

 

[virtualmaster999]

Maybe this will help. If D was the correct answer, this is an example of what the front and end views could look like:

In the top view of answer choice D, there is a vertical line running through the front piece of the figure that represents a height change taking place. This height change would have to be indicated in the front view and end view. The absence of any change in height of the front piece in the front and end views (of the original question) means that it's invalid as an answer choice. In the modified answer choice above, I've shown what it would have to look like for answer choice D to be valid.

In the original figure's front view, the front piece has a vertical line - not a horizontal one. This tells you that from the top view there is a change in depth, not height, taking place

So a vertical line always means a height change?


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[FeralisExtremum]

So a vertical line always means a height change?

It depends on what view you are looking at - but in the front view, the presence of a vertical or horizontal line means that there is a change in depth when viewed from the top. In the top view, the presence of a vertical line or horizontal line means that there is a change in height when viewed from the front.

 

[virtualmaster999]

It depends on what view you are looking at - but in the front view, the presence of a vertical line means that there is a change in depth when viewed from the top.

Thanks that helped a lot!


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[510586]

Answer D can suggest 2 scenarios.

1) That there's a stair-like object in the very front view. If this was the case, for the front view picture, we would see an L-like object instead of the rectangle with the line in the middle. In the end-view, we would also have to see a horizontal line on the very left small square.
*Edit: FeralisExtremum gave a perfect example of what it could look like.

2) Scenario 2 would be that the object in the very front is an upward-pointing triangle(looking at it from the front view perspective). An upward pointing triangle would match perfectly with the end view. However, in the front view picture, we do not see a upward triangle. Instead we see the small rectangle with the vertical line in the middle.

How do you know that the triangle is not facing downwards or just sitting flat?

 

[KyoPhan]

I'm having trouble understanding your questions. Can you expand on the question or highlight the things you are referring to?

 

[510586]

I'm having trouble understanding your questions. Can you expand on the question or highlight the things you are referring to?

Sorry you just said "the object in the very front is an upward-pointing triangle" and I was just wondering how you can tell if it is pointing up, straight, or down from the pictures alone.

 

[KyoPhan]

Sorry you just said "the object in the very front is an upward-pointing triangle" and I was just wondering how you can tell if it is pointing up, straight, or down from the pictures alone.

Right, I think I understand now. The solid line means that you can see the change occurring. Dashed means the change is happening behind your view of the object.

I was referring to answer D(the wrong answer), specifically the small rectangle with the vertical line in the middle.


We see a solid line, so from the TOP view, this means that there's a change happening at the top. In the front view, we should some sort of change happening at the top for that portion. However, looking at the front view, we did not see any piece with any resemblance.

 

[super112]

Wait, so correct me if I'm wrong. But why can't I assume D has two adjacent cubes sitting in front of the structure? Since they are touching, wouldn't we still see that distinct line in between them?

 

[FeralisExtremum]

If you had two adjacent cubes of the same dimensions touching...it wouldn't actually be two adjacent cubes, it would be a larger rectangular object (with no lines separating them). The TFE section won't put two objects of the exact same height/depth next to each other and then separate them by a line. Lines are specifically used to indicate a change in height/depth.

 

[super112]

The TFE section won't put two objects of the exact same height/depth next to each other and then separate them by a line. Lines are specifically used to indicate a change in height/depth.

Makes sense, glad to have learned that now!

 

[510586]

Right, I think I understand now. The solid line means that you can see the change occurring. Dashed means the change is happening behind your view of the object.

I was referring to answer D(the wrong answer), specifically the small rectangle with the vertical line in the middle.


We see a solid line, so from the TOP view, this means that there's a change happening at the top. In the front view, we should some sort of change happening at the top for that portion. However, looking at the front view, we did not see any piece with any resemblance.

Oh Ok so D would be wrong because the front view would not match it if it was an upward pointing triangle (the front view should look like a triangle?). And understanding that solid lines must indicate a change in height also helps (instead of two cubes same height next to each other). So the correct answer is A, a forward pointing triangle.

 

[KyoPhan]

Right, if you replace the front view's (small inner rectangle+vertical solid line) with a (triangle-pointing up), answer D would be a match with everything.

 

[510586]

Alright awesome got it. Thanks!