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| Geometry Question; Can anyone please help? | |
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| Tweet Topic Started: Dec 6 2007, 04:20 PM (432 Views) | |
| TomK | Dec 6 2007, 04:20 PM Post #1 |
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HOLY CARP!!!
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I can't figure this damn stuff out.![]() thankyou. |
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| John D'Oh | Dec 6 2007, 05:14 PM Post #2 |
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MAMIL
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What are you trying to solve? I can't figure out what the equations relate to - are they the side lengths of the triangle or are they angles? |
| What do you mean "we", have you got a mouse in your pocket? | |
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| Jack Frost | Dec 6 2007, 05:19 PM Post #3 |
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Bull-Carp
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Not enough info. Looks like an equilateral triangle but not clear what 2x+y etc refers to. jf |
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| dolmansaxlil | Dec 6 2007, 05:20 PM Post #4 |
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HOLY CARP!!!
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Agreed. More information, please! (How many times have I written that on student papers?) |
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"Your first 10,000 photographs are your worst." ~ Henri Cartier-Bresson My Flickr Photostream | |
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| Moonbat | Dec 6 2007, 05:24 PM Post #5 |
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Pisa-Carp
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If those things are lengths for the three sides that problem is hard (and you'll need Klaus or Aqua or someone who knows what they're doing because i get stuck after invoking sin(x-y) = sin x cos y-cos x sin y) Edit: Hmm maybe it shouldn't be hard and i just suck Edit2: Cosine rule ftw except i can't factorise. |
| Entia non sunt multiplicanda praeter necessitatem | |
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| Moonbat | Dec 6 2007, 05:30 PM Post #6 |
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Pisa-Carp
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If they're expressions for the three angles (where 60 = 2x-y-5) Then x = 35 and y = 5 2x-y-5 = 60 -> y = 2x - 65 x+2y+2x+y+2x-y-5 = 180 -> 5x+2y = 185 Put the two together -> 5x + 4x - 130 = 185 -> x = 35, y =5 |
| Entia non sunt multiplicanda praeter necessitatem | |
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| justme | Dec 6 2007, 05:36 PM Post #7 |
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HOLY CARP!!!
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"Men sway more towards hussies." G-D3 | |
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| ivorythumper | Dec 6 2007, 05:51 PM Post #8 |
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I am so adjective that I verb nouns!
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I am not sure what is being asked. Are X and Y the two other angles? If so then all the angles add up to 180. (2x+y)+(x+2y)=180-60 3x+3y=120 x+y=40 x=40-y plug that in. MB got x=35, y=5, which solves for x+y=40. |
| The dogma lives loudly within me. | |
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| JBryan | Dec 6 2007, 07:50 PM Post #9 |
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I am the grey one
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NEI. |
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"Any man who would make an X rated movie should be forced to take his daughter to see it". - John Wayne There is a line we cross when we go from "I will believe it when I see it" to "I will see it when I believe it". Henry II: I marvel at you after all these years. Still like a democratic drawbridge: going down for everybody. Eleanor: At my age there's not much traffic anymore. From The Lion in Winter. | |
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| apple | Dec 6 2007, 08:06 PM Post #10 |
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one of the angels
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2 |
| it behooves me to behold | |
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| Bernard | Dec 6 2007, 08:14 PM Post #11 |
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Senior Carp
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| Bernard | Dec 6 2007, 08:15 PM Post #12 |
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Senior Carp
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2B or !2B, that's the question. |
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| schindler | Dec 6 2007, 09:07 PM Post #13 |
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Fulla-Carp
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The answer is 42. But what's the question? |
| We're all mad here! | |
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| TomK | Dec 7 2007, 03:53 AM Post #14 |
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HOLY CARP!!!
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OOPS. Thank you for the answers even if I didn't really understand the question I was asking. I was looking to find the angles. Moons and MS's answers I guess are right. It for my 13yo--I unfortunately, missed taking Geometry almost completely in HS. Thank you! |
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| Klaus | Dec 7 2007, 05:12 AM Post #15 |
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HOLY CARP!!!
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Yes, that would be quite hard and probably impossible to solve analytically but only numerically. |
| Trifonov Fleisher Klaus Sokolov Zimmerman | |
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| TomK | Dec 7 2007, 05:48 AM Post #16 |
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HOLY CARP!!!
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I was looking for the angles. I should have mentioned that. sorry. That said--was this a particularly difficult problem? It seemed it to me. |
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| Jack Frost | Dec 7 2007, 05:49 AM Post #17 |
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Bull-Carp
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It's actually more of an algebra question. I like the way algebra and geometry are combined in the problem. Too often kids have algebra 1, then go on a completely different track to geometry, then back to algebra 2. jf |
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| taiwan_girl | Dec 7 2007, 08:20 AM Post #18 |
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Fulla-Carp
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To side rail this topic, there was a story in the news today. The New York airport was evacuated and a teacher was arrested when it was found he was carrying a protractor, ruler, slide ruler, and compass. Authorities announced that they believed he was a leading figure in the terrorist Al Gebra organization.
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| ivorythumper | Dec 7 2007, 09:52 AM Post #19 |
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I am so adjective that I verb nouns!
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If you are looking for the angles, then you can't stop at x and y. The x=35 and y=5 need to be plugged back in to get the angles A and B (the unknown angles, where A+B+C= 180 and C=60): A = 2x+y= 2(35)+5 = 75 B = x+2y = 35+2(5) = 45 75+45+60 = 180 QED |
| The dogma lives loudly within me. | |
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| TomK | Dec 7 2007, 10:08 AM Post #20 |
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HOLY CARP!!!
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Thank you. |
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| Phlebas | Dec 7 2007, 10:13 AM Post #21 |
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Bull-Carp
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I'm no good with angles. I'm better with curves.
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Random FML: Today, I was fired by my boss in front of my coworkers. It would have been nice if I could have left the building before they started celebrating. FML The founding of the bulk of the world's nation states post 1914 is based on self-defined nationalisms. The bulk of those national movements involve territory that was ethnically mixed. The foundation of many of those nation states involved population movements in the aftermath. When the only one that is repeatedly held up as unjust and unjustifiable is the Zionist project, the term anti-semitism may very well be appropriate. - P*D | |
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| Aqua Letifer | Dec 7 2007, 10:14 AM Post #22 |
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ZOOOOOM!
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So Calculus is more your thing then, huh? |
| I cite irreconcilable differences. | |
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| LadyElton | Dec 7 2007, 10:35 AM Post #23 |
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Fulla-Carp
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| Hilary aka LadyElton | |
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| Jack Frost | Dec 7 2007, 06:38 PM Post #24 |
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Bull-Carp
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Those compass points are way DANGEROUS. jf |
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