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[R] Math Problem

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D4L[invd]
Profile Blog Joined May 2009
Canada110 Posts
March 17 2010 03:30 GMT
#1
OKay, here goes, my math teacher had given us this problem that apparently, he said took him 6 months to figure out. Also, he said I couldn't do it in a week, I thought he was smoking, but he was right. Now, he won't tell me the answer and I really want to know what the answer is and the proof for it, if any of you have time. Thanks in advance.

Isosceles triangle has AB = AC. Point D is on AB and DCB forms an angle of 60 degrees. Point E is on AC and EBC forms an angle of 50. What is Angle DEB?
Your average D Protoss that can't get out of D because it is full of Protoss and my PvP sucks.
mOnion
Profile Blog Joined August 2009
United States5657 Posts
Last Edited: 2010-03-17 03:31:14
March 17 2010 03:30 GMT
#2
blog this, you'll get more help, as in it wont get closed
☆★☆ 7486!!! Join the Ban mOnion Anti-Trolling Initiative! - Caller | "on a scale of machine to 10, how bad is that Zerg?" - LZgamer | you are the new tl.net bonjwa monion, congrats - Rekrul | "Cheeseburgers dynamite lilacs" - Chill
Fruscainte
Profile Blog Joined December 2009
4596 Posts
March 17 2010 03:32 GMT
#3
I think I'm reading this wrong, but how does a triangle have 4 points? I know I took this two years ago, I'm just confused at the wording.

Or is it two triangles? I personally would need to see the picture of the bloody problem before I say anything at this point =/
D4L[invd]
Profile Blog Joined May 2009
Canada110 Posts
Last Edited: 2010-03-17 03:35:15
March 17 2010 03:32 GMT
#4
Is there a way i just move this or should i just copypaste it into a blog.

Also:

`````A
````/``\
```D```E
``/``````\
B--------C
Your average D Protoss that can't get out of D because it is full of Protoss and my PvP sucks.
Nal_rAwr
Profile Blog Joined July 2009
United States2611 Posts
March 17 2010 03:35 GMT
#5
On March 17 2010 12:32 Fruscainte wrote:
I think I'm reading this wrong, but how does a triangle have 4 points? I know I took this two years ago, I'm just confused at the wording.

Or is it two triangles? I personally would need to see the picture of the bloody problem before I say anything at this point =/

its actually five points, but two of them lie along two different sides of the triangle
Nony is Bonjwa
Whiplash
Profile Blog Joined October 2008
United States2929 Posts
Last Edited: 2010-03-17 03:35:42
March 17 2010 03:35 GMT
#6
just copy + paste and ask a mod to close the thread
Cinematographer / Steadicam Operator. Former Starcraft commentator/player
Nemesis
Profile Blog Joined May 2009
Canada2568 Posts
March 17 2010 03:37 GMT
#7
On March 17 2010 12:32 Fruscainte wrote:
I think I'm reading this wrong, but how does a triangle have 4 points? I know I took this two years ago, I'm just confused at the wording.

Or is it two triangles? I personally would need to see the picture of the bloody problem before I say anything at this point =/

it doesn't have 4 points. Point D and E are between AB and AC
Lee Young Ho fighting! KT P are just CHINTOSSTIC.
Muirhead
Profile Blog Joined October 2007
United States556 Posts
March 17 2010 03:44 GMT
#8
Man you've got to give us more information. Otherwise just assume that triangle ABC is equilateral or assume it is very tall and get different answers.
starleague.mit.edu
Nal_rAwr
Profile Blog Joined July 2009
United States2611 Posts
March 17 2010 03:45 GMT
#9
[image loading]
Nony is Bonjwa
Caller
Profile Blog Joined September 2007
Poland8075 Posts
March 17 2010 03:51 GMT
#10
i'm too lazy to do it myself but i heavily suspect it involves the law of sines/cosines
Watch me fail at Paradox: http://www.teamliquid.net/forum/viewmessage.php?topic_id=397564
synapse
Profile Blog Joined January 2009
China13814 Posts
Last Edited: 2010-03-17 03:58:56
March 17 2010 03:53 GMT
#11
[image loading]


(all #s in degrees)
SOLVING FOR X!
we know:

a = b +10
d = c + 10

e + f = a + b + 110 = 2b + 120 ->
(e + f)/2 = a + 50 = b + 60

180 - f - d = x
180 - e - c = y

a + c = d + b
x + y = 110

what else...
:)
Muirhead
Profile Blog Joined October 2007
United States556 Posts
March 17 2010 03:54 GMT
#12
Man in your picture it looks acute but if ABC is equilateral it is 110 TT

Too many degrees of freedom
starleague.mit.edu
Chairman Ray
Profile Blog Joined December 2009
United States11903 Posts
March 17 2010 03:56 GMT
#13
I'm on it, gimme a few hours
Ivs
Profile Joined January 2008
Australia139 Posts
March 17 2010 03:58 GMT
#14
The question is missing information. At the moment DEB varies, depending on the size of angle A.
love1another
Profile Blog Joined December 2009
United States1844 Posts
Last Edited: 2010-03-17 04:46:38
March 17 2010 03:58 GMT
#15
I'll give you a hint. Pick a number. Fill in the angles implied by that number. Smile. (oh. Make sure the number is between 35 and 110 though).
"I'm learning more and more that TL isn't the place to go for advice outside of anything you need in college. It's like you guys just make up your own fantasy world shit and post it as if you've done it." - Chill
Avidkeystamper
Profile Blog Joined June 2008
United States8556 Posts
March 17 2010 04:01 GMT
#16
The hint and only way I've seen this problem solved is to start by drawing an equilateral triangle inside the given triangle from the bottom base.
Standard angle chasing only gets dead-ends.
Jaedong
synapse
Profile Blog Joined January 2009
China13814 Posts
March 17 2010 04:01 GMT
#17
I'm tempted to just use Autodesk Inventor to draw this
:)
Jimmeh
Profile Blog Joined January 2010
United Kingdom908 Posts
Last Edited: 2010-03-17 04:02:24
March 17 2010 04:02 GMT
#18
Ignore
toopham
Profile Blog Joined December 2005
United States551 Posts
March 17 2010 04:03 GMT
#19
I conjecture that it is approximately 60
or even exactly 60.
DIE!!!
DarkPlasmaBall
Profile Blog Joined March 2010
United States45243 Posts
Last Edited: 2010-03-17 04:08:09
March 17 2010 04:05 GMT
#20
You might as well fill in the internal angles of 70 degrees and 110 degrees too, derived through vertical angles and the sum of degrees in a triangle summing to 180.
"There is nothing more satisfying than looking at a crowd of people and helping them get what I love." ~Day[9] Daily #100
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