Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Gmat Hacks Challenge Problem found in the Data Sufficiency Challenge set, I thought the answer was "C" because if you know OQ than you can draw a line to OA and form a right triangle and than if you have the heigh OP you can find the missing side (AP) which is half of AB.

OA: 34. E Explanation: Most measurements in a circle (radius, diameter, circumference, area) are closely related, but the same is not true of chords. Statement (1) is not sufficient, as knowing the length of the radius tells us nothing about the length of the chord, which could be placed anywhere between the top of the circle and just above the center. Statement (2) is also insufficient even if we know the placement of point P on the radius, theres no way to use that to find the length of the chord.

Taken together, we still have little information about chord AB. Unless the chord is part of a quadrilateral, triangle, or other fi gure, its not possible to find the length of a chord from the measurements of the circle that contains it.

Re: What is the length of chord AB in circle O above? [#permalink]

Show Tags

06 Dec 2012, 05:44

4

This post received KUDOS

What is the length of chord AB in circle O above? (1) OQ = 5 (2) OP = 3

E. Your reference that OQ is perpendicular to AB is incorrect. The perpendicular from center of circle on a chord bisects the chord. Just looking at figure and figuring that it is perpendicular is incorrect.

Re: What is the length of chord AB in circle O above? [#permalink]

Show Tags

06 Dec 2012, 05:46

BangOn wrote:

What is the length of chord AB in circle O above? (1) OQ = 5 (2) OP = 3

E. Your reference that OQ is perpendicular to AB is incorrect. The perpendicular from center of circle on a chord bisects the chord. Just looking at figure and figuring that it is perpendicular is incorrect.

Re: What is the length of chord AB in circle O above? [#permalink]

Show Tags

28 Mar 2014, 09:46

1

This post received KUDOS

Expert's post

joshlevin90 wrote:

could some one explain why you cant make a triangle with the given information to find AB

Not sure which triangle you are taking about...

As for the answer: all we know even when we combine the statements is the radius of the circle (r=OQ=5) and the positioning of point P on OQ (OP=3). We know nothing about the chord AB other than it passes through point P: it can be at any angle to OQ, which gives different values of its length.

Re: What is the length of chord AB in circle O above? [#permalink]

Show Tags

28 Oct 2014, 00:22

Bunuel wrote:

joshlevin90 wrote:

could some one explain why you cant make a triangle with the given information to find AB

Not sure which triangle you are taking about...

As for the answer: all we know even when we combine the statements is the radius of the circle (r=OQ=5) and the positioning of point P on OQ (OP=3). We know nothing about the chord AB other than it passes through point P: it can be at any angle to OQ, which gives different values of its length.

Re: What is the length of chord AB in circle O above? [#permalink]

Show Tags

28 Oct 2014, 03:57

2

This post received KUDOS

Expert's post

vietnammba wrote:

Bunuel wrote:

joshlevin90 wrote:

could some one explain why you cant make a triangle with the given information to find AB

Not sure which triangle you are taking about...

As for the answer: all we know even when we combine the statements is the radius of the circle (r=OQ=5) and the positioning of point P on OQ (OP=3). We know nothing about the chord AB other than it passes through point P: it can be at any angle to OQ, which gives different values of its length.

Attachment:

Untitled.png

Hope it's clear.

Hi Bunuel,

In case OQ bisects AB, is the answer C?

"Bisect" means to divide into two equal parts. So, AB bisects OQ at P, means that OP = PQ = 2.5. In this case the answer would still be E, because the angle at which AB cuts OQ would still be unknown.

But if we were told that AB is perpendicular to OQ, then the answer would be C.

Re: What is the length of chord AB in circle O above? [#permalink]

Show Tags

10 Sep 2015, 18:56

In case OQ bisects AB, is the answer C?[/quote]

"Bisect" means to divide into two equal parts. So, AB bisects OQ at P, means that OP = PQ = 2.5. In this case the answer would still be E, because the angle at which AB cuts OQ would still be unknown.

But if we were told that AB is perpendicular to OQ, then the answer would be C.

Hope it's clear.[/quote]

In reference to the highlighted portion, isn't it possible to solve the question if we just know the radius OQ. 30, 30, 120 with a distribution of x, x, x\(\sqrt{3}\) for the triangle OAB ?

gmatclubot

Re: What is the length of chord AB in circle O above?
[#permalink]
10 Sep 2015, 18:56

Excellent posts dLo saw your blog too..!! Man .. you have got some writing skills. And Just to make an argument = You had such an amazing resume ; i am glad...

So Much $$$ Business school costs a lot. This is obvious, whether you are a full-ride scholarship student or are paying fully out-of-pocket. Aside from the (constantly rising)...

London is the best kept secret of the corporate world. It is English speaking and time delayed by only 5 hours. That means when London goes home at 5...