Results 1 to 3 of 3
  1. #1
    5 Star Lounger
    Join Date
    Jan 2001
    Location
    La Jolla,CA
    Posts
    1,078
    Thanks
    13
    Thanked 36 Times in 35 Posts

    From the OCTOBER 2012 SAT

    [considered a level 5 (range 1-5, 5 being highest difficulty) by the College Board]

    The lengths of two sides of a triangle are 5 and 12,
    and the length of the third side is an integer. What
    is the greatest possible perimeter of the triangle?

    (A) 22
    (B) 29
    (C) 30
    (D) 33
    (E) 34

  2. Get our unique weekly Newsletter with tips and techniques, how to's and critical updates on Windows 7, Windows 8, Windows XP, Firefox, Internet Explorer, Google, etc. Join our 480,000 subscribers!

    Excel 2013: The Missing Manual

    + Get this BONUS — free!

    Get the most of Excel! Learn about new features, basics of creating a new spreadsheet and using the infamous Ribbon in the first chapter of Excel 2013: The Missing Manual - Subscribe and download Chapter 1 for free!

  3. #2
    5 Star Lounger Maudibe's Avatar
    Join Date
    Aug 2010
    Location
    Pa, USA
    Posts
    1,199
    Thanks
    45
    Thanked 228 Times in 211 Posts


    I thought that this was one of the easier problems so I would have given it a level of 1. Since it is rated a 5, I am guessing that I am totally overlooking something....my life story

  4. #3
    5 Star Lounger
    Join Date
    Jan 2001
    Location
    La Jolla,CA
    Posts
    1,078
    Thanks
    13
    Thanked 36 Times in 35 Posts
    You aren't overlooking anything...your answer is correct. The triangle is not necessarily a right triangle.
    If it were, the lengths would have been 5-12-13, making the perimeter 30. But, the length of the other side could be 16 as you pointed out. The math rule is that the sum of any two sides is larger than the third. That rules out 17 as you realized.

    I suspect they classified this as difficult because many students immediately think it's 5-12-13 because they a few triples in their mind and under test pressure would have jumped on that (wrong) answer.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •