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Geometry Question; Can anyone please help?
Topic Started: Dec 6 2007, 04:20 PM (432 Views)
TomK
HOLY CARP!!!
I can't figure this damn stuff out.

Posted Image

thankyou.
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John D'Oh
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MAMIL
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
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Bull-Carp
Not enough info.

Looks like an equilateral triangle but not clear what 2x+y etc refers to.

jf
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Let it be said by our children's children that when we were tested we refused to let this journey end, that we did not turn back nor did we falter; and with eyes fixed on the horizon and God's grace upon us, we carried forth that great gift of freedom and delivered it safely to future generations.
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dolmansaxlil
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HOLY CARP!!!
Agreed. More information, please! (How many times have I written that on student papers?)
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Moonbat
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Pisa-Carp
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
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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
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HOLY CARP!!!
TomK
Dec 6 2007, 08:20 PM
I can't figure this damn stuff out.

Posted Image

thankyou.

:shrug:
"Men sway more towards hussies." G-D3
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ivorythumper
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I am so adjective that I verb nouns!
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.
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JBryan
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NEI.
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apple
one of the angels
2
it behooves me to behold
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Bernard
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apple
Dec 6 2007, 08:06 PM
2

:D
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Bernard
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2B or !2B, that's the question.
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schindler
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The answer is 42.

But what's the question?
We're all mad here!
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TomK
HOLY CARP!!!
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
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HOLY CARP!!!
Moonbat
Dec 7 2007, 03:24 AM
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)

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
HOLY CARP!!!
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
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TomK
Dec 7 2007, 07:53 AM
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!

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
Quote:
 
Let it be said by our children's children that when we were tested we refused to let this journey end, that we did not turn back nor did we falter; and with eyes fixed on the horizon and God's grace upon us, we carried forth that great gift of freedom and delivered it safely to future generations.
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taiwan_girl
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Jack Frost
Dec 7 2007, 07:49 AM
TomK
Dec 7 2007, 07:53 AM
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!

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

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
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I am so adjective that I verb nouns!
TomK
Dec 7 2007, 06:48 AM
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.

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
HOLY CARP!!!
Thank you.

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Phlebas
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I'm no good with angles.
I'm better with curves.

Posted Image
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Aqua Letifer
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So Calculus is more your thing then, huh?
I cite irreconcilable differences.
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LadyElton
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Phlebas
Dec 7 2007, 01:13 PM
I'm no good with angles.
I'm better with curves.

Posted Image

:excited: :devilgrin:
Hilary aka LadyElton
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Jack Frost
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taiwan_girl
Dec 7 2007, 12:20 PM
Jack Frost
Dec 7 2007, 07:49 AM
TomK
Dec 7 2007, 07:53 AM
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!

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

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. :)

Those compass points are way DANGEROUS.

jf

Quote:
 
Let it be said by our children's children that when we were tested we refused to let this journey end, that we did not turn back nor did we falter; and with eyes fixed on the horizon and God's grace upon us, we carried forth that great gift of freedom and delivered it safely to future generations.
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