# math Q

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

1. ### ATLATLATL 2+ Year Member

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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?

2. ### DentalKitty 5+ Year Member

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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?

3. ### jdmsamurai 2+ Year Member

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i could have sworn the three angles of a triangle add up to 180.....

4. ### Benoir 2+ Year Member

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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

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5. ### Streetwolf Ultra Senior Member Dentist 7+ Year Member

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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.

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6. ### DentalKitty 5+ Year Member

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

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