Welcome! Check out our free B-School Guides to learn how you compare with other applicants.
Login or Register
 

ps 2

This topic has 2 expert replies and 6 member replies
Bookmark
Previous Topic Next Topic
vaivish GMAT Destroyer! Default Avatar
Joined
29 Apr 2008
Posted:
371 messages
Followed by:
1 members
Thanked:
6 times
ps 2 Post Tue Aug 05, 2008 11:51 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    . The side surface of a cylinder is reeled with a rectangular plate. If the height of a cylinder tank is 12 feet and the perimeter of the circular base is 9 feet, what is the diagonal of the rectangular plate?
    (A) 13
    (B) 15
    (C) 18
    (D) 20
    (E) 21


    Oa is B

    Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
    malolakrupa Rising GMAT Star Default Avatar
    Joined
    18 Jul 2008
    Posted:
    58 messages
    Thanked:
    2 times
    Post Tue Aug 05, 2008 7:36 pm
    Since the rectangular plate is reeled , the height becomes the length and the perimeter of the circular base becomes the breadth and using the famous theorem for right angle triangles ,

    diagonal^2 = length^2 + base^2 we get diagonal = 15 which is B.

    vaivish GMAT Destroyer! Default Avatar
    Joined
    29 Apr 2008
    Posted:
    371 messages
    Followed by:
    1 members
    Thanked:
    6 times
    Post Thu Aug 07, 2008 12:07 pm
    see 9 is perimeter so the diameter would be 9/pia. so how can we use 9^@ in the equation to get 15 as ans...

    GMAT/MBA Expert

    Stuart Kovinsky GMAT Instructor
    Joined
    08 Jan 2008
    Posted:
    3156 messages
    Followed by:
    460 members
    Thanked:
    1431 times
    GMAT Score:
    800
    Post Thu Aug 07, 2008 12:50 pm
    vaivish wrote:
    see 9 is perimeter so the diameter would be 9/pia. so how can we use 9^@ in the equation to get 15 as ans...
    The base of the rectangle IS the perimiter of the circle - there's no need to calcluate the circle's diameter.

    _________________
    Stuart Kovinsky, B.A. LL.B.
    Kaplan Test Prep & Admissions
    Toronto Office
    1-800-KAP-TEST
    www.kaptest.com

    Learn more about me

    Free GMAT Practice Test under Proctored Conditions! - Find a practice test near you or live and online in Kaplan's Classroom Anywhere environment. Register today!
    vaivish GMAT Destroyer! Default Avatar
    Joined
    29 Apr 2008
    Posted:
    371 messages
    Followed by:
    1 members
    Thanked:
    6 times
    Post Sat Aug 09, 2008 7:49 am
    can you explain this one please. as i know perimeter is 2*pia* r. So how can it be the base of SQuare. if u draw the diagram it will be more clear to u. Thanks in advance

    raunekk GMAT Titan Default Avatar
    Joined
    16 Apr 2008
    Posted:
    1161 messages
    Thanked:
    56 times
    Target GMAT Score:
    750+
    Post Sat Aug 09, 2008 9:17 am
    u dont have to use 2 * pie * r...

    the circumference of the base of clyinder= the width of the rectangle

    height of the cylinder= length of the rectangle.

    the diagonal wll be given by d pythagoras theorem.

    andes1 Rising GMAT Star Default Avatar
    Joined
    25 Nov 2007
    Posted:
    48 messages
    Thanked:
    1 times
    Target GMAT Score:
    701
    Post Sat Aug 09, 2008 7:49 pm
    ????
    the circumference of the base of clyinder= the width of the rectangle ???
    reeled???

    _________________
    LEARNING ENGLIS H

    GMAT/MBA Expert

    Stuart Kovinsky GMAT Instructor
    Joined
    08 Jan 2008
    Posted:
    3156 messages
    Followed by:
    460 members
    Thanked:
    1431 times
    GMAT Score:
    800
    Post Sat Aug 09, 2008 8:34 pm
    andes1 wrote:
    ????
    the circumference of the base of clyinder= the width of the rectangle ???
    reeled???
    "Reeled" is a strange word that I wouldn't expect to see on the real GMAT, but it means "wrapped around".

    In other words, you form the rectangle by cutting a straight line down the side of the cylinder and laying out the cylinder flat along the ground. (Picture a piece of paper wrapped all the way around a can - if you were to lay the paper flat, it would be a rectangle.)

    So, the height of the cylinder becomes the height of the rectangle and the perimiter of the base of the cylinder ends up becoming the base of the rectangle.

    _________________
    Stuart Kovinsky, B.A. LL.B.
    Kaplan Test Prep & Admissions
    Toronto Office
    1-800-KAP-TEST
    www.kaptest.com

    Learn more about me

    Free GMAT Practice Test under Proctored Conditions! - Find a practice test near you or live and online in Kaplan's Classroom Anywhere environment. Register today!
    andes1 Rising GMAT Star Default Avatar
    Joined
    25 Nov 2007
    Posted:
    48 messages
    Thanked:
    1 times
    Target GMAT Score:
    701
    Post Mon Aug 11, 2008 4:16 pm
    thanks a lot

    _________________
    LEARNING ENGLIS H

    Best Conversation Starters
    1 varun289 43 topics
    2 greenwich 30 topics
    3 sana.noor 22 topics
    4 guerrero 20 topics
    5 killerdrummer 18 topics
    See More Top Beat The GMAT Members...

    Most Active Experts
    1 image description Brent@GMATPrepNow

    GMAT Prep Now Teacher

    		 205 posts
    2 image description Anju@Gurome

    Gurome

    		 146 posts
    3 image description GMATGuruNY

    The Princeton Review Teacher

    		 145 posts
    4 image description Jim@StratusPrep

    Stratus Prep

    		 96 posts
    5 image description David@VeritasPrep

    Veritas Prep

    		 39 posts
    See More Top Beat The GMAT Experts