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# Tough Coordinate Geometry problem from the gmac test

Author Message
Manager
Joined: 03 Feb 2010
Posts: 68

Kudos [?]: 149 [1], given: 4

Tough Coordinate Geometry problem from the gmac test [#permalink]

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10 Jul 2010, 19:17
1
KUDOS
5
This post was
BOOKMARKED
00:00

Difficulty:

(N/A)

Question Stats:

36% (05:06) correct 64% (01:37) wrong based on 41 sessions

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Can anyone help with this?

OPEN DISCUSSION OF THIS QUESTION IS HERE: in-the-figure-above-points-p-and-q-lie-on-the-circle-with-85154.html
Attachments

problem.GIF [ 5.22 KiB | Viewed 3395 times ]

Kudos [?]: 149 [1], given: 4

Manager
Joined: 03 Jun 2010
Posts: 172

Kudos [?]: 71 [0], given: 40

Location: United States (MI)
Concentration: Marketing, General Management
Re: Tough Coordinate Geometry problem from the gmac test [#permalink]

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10 Jul 2010, 21:53
The answer is B, because of the tg 45 = 1. Look, OQ is 45 degrees to Ox.

Kudos [?]: 71 [0], given: 40

Manager
Joined: 11 Jul 2010
Posts: 223

Kudos [?]: 105 [0], given: 20

Re: Tough Coordinate Geometry problem from the gmac test [#permalink]

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11 Jul 2010, 01:22
Well, this took me way more than 2 minutes, but knowing the answer I could come up with the following method (not sure if its recommended):

PO sqare + OQ square = PQ square

Equation of circle with centre 0,0 is x square + y square = radius square

putting in coordinates of P into the equation we get radius of 2 (thus PO = OQ = 2)

=> 2SQ. + 2SQ. = PQ sq.
=> root 8 = 2 root 2 = PQ = approx 2 X 1.4 = 2.8

Now PQ = distance from x coordinate of P to center + distance of x coordinate of Q to center

=> 2.8 = root 3 (or 1.7) + s
=> 2.8 -1.7 = ~1 = s

Guys/Gals, is there a more elegant way to do this? there must be...

Kudos [?]: 105 [0], given: 20

Manager
Joined: 27 Mar 2010
Posts: 118

Kudos [?]: 15 [0], given: 17

Re: Tough Coordinate Geometry problem from the gmac test [#permalink]

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12 Jul 2010, 08:20

Kudos [?]: 15 [0], given: 17

Intern
Joined: 05 Jul 2010
Posts: 26

Kudos [?]: 23 [6], given: 7

Re: Tough Coordinate Geometry problem from the gmac test [#permalink]

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12 Jul 2010, 10:29
6
KUDOS
1
This post was
BOOKMARKED
Attachment:

problem.jpg [ 12.37 KiB | Viewed 3315 times ]

Hence we see that the correct answer is 1.

Hope this helps.

PS: In the triangle on the right the angles are wrong. 30 is 60 and 60 is 30. Sorry for that.
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Kudos [?]: 23 [6], given: 7

Founder
Joined: 04 Dec 2002
Posts: 15588

Kudos [?]: 28513 [0], given: 5114

Location: United States (WA)
GMAT 1: 750 Q49 V42
Re: Tough Coordinate Geometry problem from the gmac test [#permalink]

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12 Jul 2010, 11:02
Great diagram! Thanks and Kudos!
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Kudos [?]: 28513 [0], given: 5114

Re: Tough Coordinate Geometry problem from the gmac test   [#permalink] 12 Jul 2010, 11:02
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