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math Q

Discussion in 'DAT Discussions' started by ATLATLATL, Apr 24, 2007.

  1. ATLATLATL

    ATLATLATL 2+ Year Member

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    Jan 9, 2007
    ok so this is an ez Q but i'm forgetting a very basic concept...LCD!!! so how is the lcd of the three angles below 15?!
    lemme post the question first

    if the angles of a triangle are in a ratio of 2:3:7 then the degree measures of the angles must be?
     
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  3. DentalKitty

    DentalKitty 5+ Year Member

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    Mar 12, 2007
    With (2x+3x+7x)=360 x=12, so the angles are 60, 90, and 210. I don't see how the LCD of 2,3,7 or 60,90,210 is 15. Wouldn't it be 42 and 630, respectively? If you're talking about least common multiple (LCM) of the actual angles it wouldn't be 15 either, it would be 3 (although 15 is a multiple). Where did the 15 come from?
     
  4. jdmsamurai

    jdmsamurai 2+ Year Member

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    Feb 11, 2007
    i could have sworn the three angles of a triangle add up to 180.....:eek:
     
  5. Benoir

    Benoir 2+ Year Member

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    Apr 7, 2007
    180 degrees in a triangle.

    Ratio 2:3:7
    2+3+7 = 12
    180/12 = 15
    2(15):3(15):7(15)
    30:45:105
     
  6. Streetwolf

    Streetwolf Ultra Senior Member Dentist 7+ Year Member

    1,801
    5
    Oct 25, 2006
    NJ
    They do haha.

    2:3:7. So 2+3+7 = 12. 180/12 = 15.

    2x15 = 30 (angle 1)
    3x15 = 45 (angle 2)
    7x15 = 105 (angle 3)

    Total = 180.

    Edit: Bah I had this one on standby and didn't refresh for 10 minutes.
     
  7. DentalKitty

    DentalKitty 5+ Year Member

    202
    0
    Mar 12, 2007
    Yes, I believe my brain has been turned off all day :oops: That's what I get for trying to flip back and forth between SDN and work. Sorry about that!
     

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