• e-gmat Exclusive Offer
    Get 300+ Practice Questions
    25 Video lessons and 6 Webinars for FREE

    Available with Beat the GMAT members only code

    MORE DETAILS
    e-gmat Exclusive Offer
  • Kaplan Test Prep
    Free Practice Test & Review
    How would you score if you took the GMAT

    Available with Beat the GMAT members only code

    MORE DETAILS
    Kaplan Test Prep
  • Magoosh
    Magoosh
    Study with Magoosh GMAT prep

    Available with Beat the GMAT members only code

    MORE DETAILS
    Magoosh
  • Economist Test Prep
    Free Trial & Practice Exam
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    Economist Test Prep
  • Varsity Tutors
    Award-winning private GMAT tutoring
    Register now and save up to $200

    Available with Beat the GMAT members only code

    MORE DETAILS
    Varsity Tutors
  • EMPOWERgmat Slider
    1 Hour Free
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    EMPOWERgmat Slider
  • PrepScholar GMAT
    5 Day FREE Trial
    Study Smarter, Not Harder

    Available with Beat the GMAT members only code

    MORE DETAILS
    PrepScholar GMAT
  • Veritas Prep
    Free Veritas GMAT Class
    Experience Lesson 1 Live Free

    Available with Beat the GMAT members only code

    MORE DETAILS
    Veritas Prep
  • Target Test Prep
    5-Day Free Trial
    5-day free, full-access trial TTP Quant

    Available with Beat the GMAT members only code

    MORE DETAILS
    Target Test Prep

Triangle QRS is inscribed in a circle as shown above....

This topic has 2 expert replies and 0 member replies
cherry yeung Newbie | Next Rank: 10 Posts Default Avatar
Joined
26 Dec 2016
Posted:
2 messages

Triangle QRS is inscribed in a circle as shown above....

Post Wed Dec 28, 2016 7:14 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Hi,

    Could some please help to explain why statement 2 cannot be used to confirm qrs is a right of triangle? Based on Pythagorean theorem, if qrs is a right angle triangle, qr's square root + qs's square root = rs's square root. Thus qs = 4. Which is a right angle triangle.

    Please see attached picture for question and explanation from the book.

    Regards,

    Cherry
    ttps://postimg.org/image/k37zrcd0t/" target="_blank">

    Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
    Post Wed Dec 28, 2016 7:27 am
    cherry yeung wrote:
    Hi,

    Could some please help to explain why statement 2 cannot be used to confirm qrs is a right of triangle? Based on Pythagorean theorem, if qrs is a right angle triangle, qr's square root + qs's square root = rs's square root. Thus qs = 4. Which is a right angle triangle.

    Please see attached picture for question and explanation from the book.

    Regards,

    Cherry
    ttps://postimg.org/image/k37zrcd0t/" target="_blank">
    The problem with your analysis of statement 2 is that you first assume that QRS is a right angle triangle so that you can use the Pythagorean theorem to find the length of the 3rd side. Once you find the length of the 3rd side, you conclude that QRS is a right angle triangle.

    So, you are assuming that QRS is a right angle triangle in order to prove that QRS is a right angle triangle.

    Cheers,
    Brent

    _________________
    Brent Hanneson – Founder of GMATPrepNow.com
    Use our video course along with Beat The GMAT's free 60-Day Study Guide

    Check out the online reviews of our course
    Come see all of our free resources

    GMAT Prep Now's comprehensive video course can be used in conjunction with Beat The GMAT’s FREE 60-Day Study Guide and reach your target score in 2 months!
    Post Wed Dec 28, 2016 6:34 pm
    Hi cherry yeung,

    In DS questions, you can't trust that any pictures are drawn to scale (so you should be cynical about what you THINK a shape represents). Here, it looks the triangle might be a right triangle, but there is no information to confirm that.

    One of the ways to have a right triangle under those conditions is IF all three points are on the circumference of the circle AND one of the sides is the DIAMETER of the circle. Here, we don't know whether RS is the diameter or not, so there's no way to know whether we have a right triangle or not.

    From Fact 2, we know that two of the sides are 3 and 5, so the missing side COULD be a 4 (which would be a right triangle), but it could also be 4.1 (which is NOT a right triangle).

    GMAT assassins aren't born, they're made,
    Rich

    _________________
    Contact Rich at Rich.C@empowergmat.com

    Best Conversation Starters

    1 lheiannie07 116 topics
    2 LUANDATO 62 topics
    3 swerve 62 topics
    4 ardz24 61 topics
    5 AAPL 58 topics
    See More Top Beat The GMAT Members...

    Most Active Experts

    1 image description Brent@GMATPrepNow

    GMAT Prep Now Teacher

    172 posts
    2 image description Scott@TargetTestPrep

    Target Test Prep

    154 posts
    3 image description Rich.C@EMPOWERgma...

    EMPOWERgmat

    131 posts
    4 image description EconomistGMATTutor

    The Economist GMAT Tutor

    127 posts
    5 image description GMATGuruNY

    The Princeton Review Teacher

    125 posts
    See More Top Beat The GMAT Experts