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# PS: Geometry parallel lines

Author Message
TAGS:
Director
Joined: 20 Jul 2004
Posts: 593
Followers: 1

Kudos [?]: 48 [0], given: 0

PS: Geometry parallel lines [#permalink]  06 Sep 2004, 20:36
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
A Princeton Question
Attachments

Parallel.JPG [ 12.51 KiB | Viewed 607 times ]

Director
Joined: 16 Jun 2004
Posts: 893
Followers: 2

Kudos [?]: 19 [0], given: 0

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

A+B+C = 135+135+100 = 370.
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5078
Location: Singapore
Followers: 22

Kudos [?]: 184 [0], given: 0

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

total 370
Manager
Joined: 02 Apr 2004
Posts: 224
Location: Utrecht
Followers: 1

Kudos [?]: 13 [0], given: 0

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

Regards,

Alex
Director
Joined: 08 Jul 2004
Posts: 604
Followers: 2

Kudos [?]: 82 [0], given: 0

Of course 370 but what is worrying me is
x should be equal to z, if you remember theorems.
S
Manager
Joined: 05 Sep 2004
Posts: 97
Followers: 1

Kudos [?]: 3 [0], given: 0

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.
Director
Joined: 20 Jul 2004
Posts: 593
Followers: 1

Kudos [?]: 48 [0], given: 0

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.
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.
Attachments

Parallel_Ans.JPG [ 28.66 KiB | Viewed 569 times ]

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