PS: Geometry parallel lines

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PS: Geometry parallel lines [#permalink]

06 Sep 2004, 21:36

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A Princeton Question

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Director

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06 Sep 2004, 22:19

Z=45, then C=180-45=135.
C=B =135
X=80, then A= 180-80=100

A+B+C = 135+135+100 = 370.

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07 Sep 2004, 02:05

a = 180-80 = 100
b = 180-45 = 135
c = 180-45 = 135

total 370

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07 Sep 2004, 14:20

Yes the answer is 370.

Would this be classified as an easy question on the real GMAT?

Regards,

Alex

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07 Sep 2004, 14:48

Of course 370 but what is worrying me is
x should be equal to z, if you remember theorems.
S

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07 Sep 2004, 15:58

Yeah, if x is not equal to z, then c is not equal to b. Apparently, while the figure is not drawn to scale, it is also not drawn to angles.

Also, are the two parallel lines actually supposed to be parallels?

If, z = 45, then c = 135.

If x = 80, a = 100 = b.

Then, a + b + c = 335.

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07 Sep 2004, 17:13

saurya_s wrote:

what is the source of this question?

Its a Princeton 2004 CD adaptive exam question. I was surprised to see such substandard question from princeton. Even though it says that "the diagram is not drawn to scale", there may be more than one correction we can apply (see attached picture), but only one of them was present as an answer choice.

OA given is as everyone said: (E). 370.
And Princeton's explanation is, "Use the rule of 180. If z = 45, then both b and c must be 180 - 45 = 135. That's 270 degrees right there. since x = 80, a must be equal to 180-80 = 100. Thus a+b+c = 370".

I was too confused, spent 4 minutes and was adamant not to move, but later realised there is no one to complain/prove the point to. :evil:

When b+c exceeded 270, I chose 370 and moved on.
There are many problems like this which would make you think that the ETS guys have lost sense. Probably, it is just a trap to make you loose time and control. We should choose the "best possible" answer and move on.

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Parallel_Ans.JPG [ 28.66 KiB | Viewed 208 times ]

[#permalink] 07 Sep 2004, 17:13

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PS: Geometry parallel lines

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PS: Geometry parallel lines

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