guys i solved this
>>143490984
... and?
>>143491286
are you proud
>>143490984
Congrats for being above the average IQ in /a/, now kill yourself faggot.
>>143491038
>100
How so?
>>143491354
BEA, BED, and DEC have to add up to 180, so DEC is 120.
The angles of triangle DEC have to add up to 180, so the angle EDC is 180-20-120 = 40.
The first rule applies to get EDB = 100.
>>143491461
there is no way to know DEC is 120 because the only angle you can work out of the 3 with the information given is BEA
I don't think there's sufficient information
>>143491354
i promise you did this but i have no idea how i got the 100
Shit I dunno. This is what Indian and Chinese people are for.
>>143491038
three trig laws, re-try
This is all I can do without trig
>>143491971
i didnt use any laws i also forgot how i got the 100 fuck
Unless one comes up with some bulshit.
0<a<130 is the sol.
>>143490984
NS
without a corresponding angle, or a lead into one, the bottom portion of the problem is unsolvable by the set parameters.
>>143491971
She said no trig, stuuuupid.
>>143492367
Correct, NS means no solution. I would headpat you if i could anon.
>>143491759
there's always this person.
>>143492017
you weren't just baiting? that's shameful, anon.
This is not /a/ related. /v/ does the same shit with video game math problems.
It's just another blogging/americanvseurope education/bait- thread.
Sage and report.
>>143492429
i think i was looking at BDC knew D was 140 then just did 140-40 (idk why) but yea i think its unsolvable. can someone use the trig laws and please tell me what alpha is so i can sleep
I tried solving this a year ago. You can't. You fucking can't.
There is no fixed sol only logical sol can be derived.
You wise guys sure like making shit harder than it has to be.
>>143493112
Kek.Sadly it's not drawn to scale
>>143493112
Oh anon, you card.
>>143491038
By this nigger logic alpha could also be 100 you fuck wit, so long as the other angle was 30.
>>143492464
>this is not /a/ related because i said so
Unless you're the janitor or the mod, there's nothing you can do about it.
>>143493112
Nice.
The answer is rape.
>>143493194
>Kek
Fuck off.
The angles don't look correct, though. Those degree shapes look too big and too small.
i think i solved it w/ trig
gimme a sec to calculate ans, and ill post pic soon
>>143490984
Give this bitch the 'D' so she can measure it.
>>143493434
shit jk
![IMG_2100[1].jpg](https://i.imgur.com/7PXulnm.jpg "IMG_2100[1].jpg")
>>143493570
actually, here:
so first notice ABC is iscoceles -> BC = AC because A and B are both 80
draw line from C to a new point F
>>143493704
Let angle ACF be x, so that BCF is 20-x. Then, BFC is 80-x, and CFA is 100-x.
Law of Sines on BFC gives (sin80)/CF=(sin80-x)/BC
Law of Sines on AFC gives (sin80)/CF=(sin100-x)/AC
But AC=BC since ABC is isosceles, so (sin100-x)=(sin80-x)
So x=10
You fags we had this in a thread like 2 days ago. The real answer if it's drawn to scale is ~65-70 degrees, however it's impossible to solve with just geometry since the picture needs to list one more angle to be solvable.
![IMG_0115[1].jpg](https://i.imgur.com/wV6MZOw.jpg "IMG_0115[1].jpg")
>>143493765
Actually, that last step wasn't even necessary - here is the 2nd to last step.
We can easily calculate BEA=30 just by using triangle properties. Now, let alpha (I'm gonna call it a) be angle AED, the one we want to find. Since it is easy to calculate AEC=150, that means DEC=150-a.
>>143493878
Now, not that CBD=BCD=20. So isosceles, so BD=DC.
Law of sines on EDC: sin (150-a)/DC=sin (20)/ED
Law of sines on BDE: sin(30+a)/BD=sin(20)/ED
But BD=DC, so 150-a=30+a
a=90
>>143493944
*note that CBD=BCD=20
I think that's right... as not to scale as it looks, there seems to be nothing wrong with the proof.
That said, I could have not drawn any extra lines, and went straight to law of sines and that would be a very simple problem.
>>143490984
THE ANSWER IS DICKS
https://www.duckware.com/tech/worldshardesteasygeometryproblem.html
>>143492409
It's not that there's no solution, however there's no way to discern a specific value because there's no way to split the highlighted angles.
However if you attempt to trial and error by inserting a specific value and solving from it, you'll find that most appropriate values will actually be functional. The answer is some range but I'm too lazy to specify what, presumably anything that would actually fit in the overall 150 degree angle.
>>143493944
whoops, sorry, messed up on last equation: a=60
>>143490984
Is EDA supposed to be square?
If the angle in A is 10° and the one in D is 90° then alpha is 80°.
But it A doesn't look like 10°.
Why is this meme geometry problem just doesn't stop to pest /a/? Is /a/ autistic?
https://www.duckware.com/tech/worldshardesteasygeometryproblem.html
>>143494034
>130 angle is smaller than 50 angle
>40 angle is smaller than 60 angle
Fuck math
All triangles = 180
Circle in the middle = 360
Straights = 180
>>143494229
Not to scale.
>up for over 2 hours
Good work, Mods.
>>143494256
How did you get 110 and 20?
>>143492042
>they're congruent
>>143494407
I can't remember. I think guess and check.
>>143494464
That is the easiest way.
>>143494483
Yeah, but it seems to work.
>>143493336
>trying this hard to fit in
You fuck off.
>>143494149
Kek
>>143492042
The example triangle is fucking atrocious holy shit. I bet this is why engineers always redraw things for themselves, because people pull this kind of faggotry.
>>143494464
Guess and check doesn't work because there are multiple solutions that satisfy all triangles=180 circle=360 straights=180, but only one of them is actually correct. If >>143493765 has done his trig right it's 10, the point is to get to that answer without trig.
>>143494640
Without trig one can only form sets of solutions using equations like >>143492760.
>>143490984
I found more fucking angles than I needed. Fuck math.
>>143490984
Don't upload images of my girlfriend, thanks.
>>143494928
Going by the link in >>143494149 you can do more if you happen to know some obscure rules regarding isosceles triangles that trigfags probably won't know either.
>>143494640
There was only like the last 3 or so that were guess and check, but yeah.
Why are people mentioning trig here? Since we dont know any of sides' lengths trig wont do shit here. I dare any of you to solve this with trig.
>>143494003
In Kuro!
We need Mr. Feynman.
I'm sure he would find a very clever way to solve this.
>>143495274
Label the point where they all cross in the middle F
Call length AB 1 unit
(Sin 50)/1=(sin 70)/BF=(sin 60)/AF
Do the similar thing for all triangles baring CDE and DEF
You now know the lengths DF and EF
Using the cosine rule to find ED
(ED)^2=(DF)^2+(EF)^2-2(DF)(EF)cos 50
You can now use (Sin 50)/(ED)=(sin alpha)/(DF)
or alpha = arcsin ((Sin 50)(DF)/(ED))
>>143494016
>>143494149
The solution here is wrong. DFA = FAB because parallel lines, but in his answer they don't.
Can we use the animated one already? It's in the latest PV
![Fate_kaleid liner PV3.mp4_snapshot_00.26_[2016.06.30_04.32.08].jpg](https://i.imgur.com/UaQsMT1.jpg "Fate_kaleid liner PV3.mp4_snapshot_00.26_[2016.06.30_04.32.08].jpg")
>>143496359
Feel free to edit out the diagram on the board.
>>143496440
Is she teaching how to give Shirou an erection?
>>143493336Zozzle.
>>143490984
>that's a 50 degree angle
I can't, I just can't, my OCD won't take it
>>143495274
Good thing you don't need a side length. Just assign an arbitrary length to an arbitrary side, and all the angles fall into place since all sizes of the figure are just similar figures, which all have unchanging angles.
>>143492760
Got this system. Plugged in 97 million.
Alpha is 97 million.
>/a/ can't into math.
There is no answer
>>143490984
There is no solution for this because the numbers are made up gobbledygook. Which means that at no time can angles be similar because if we base our values on reality the triangles would not come out such as they are and therefore the total figure is unknown.
In short the total figure would not come off as a triangle and therefore it cannot be solved.
>>143494149
>Why is this meme geometry problem just doesn't stop to pest /a/?
Because you pest is the geometry problem with your own stops to /a/.
>>143495710
What? In his answer they do.
>>143498799
Exactly. It's kind of like how professors create the workings of a problem and then at the very end make something not make sense to throw students off. Kind of like the character imho
i dropped out of highschool so i don't know what you guys are talking about
however i do know that this sort of thing isn't used in real life. at all. it is worthless.
good job learning something pointless i guess.
>>143498960
You don't need high school to learn it. Trig is probably the best. You can literally learn all math on your own. I did this, went to school and laughed at at least 1/2 of the tests.
>>143498960
What? You get taught this stuff in middle school. You don't even need to go to school to be taught this stuff. 20 seconds on google and common sense should teach you all need to know to solve these kinds of problems.
Why does the 60 degree angle look larger than the 70 degree angle?
>>143501725
Because the figure is not to scale.
>>143501725
You should be asking why the 20 degree angle looks almost the same size as the 60 degree angle when they're literally right next to each other.
>>143490984
>>143501742
I remember trying to help someone that couldn't understand the whole not drawn to scale thing. It was like they were completely mindbroken and kept trying to physically measure the angles. Some people just can't understand abstract concepts.
>>143498702
Yeah, you keep telling that to your self.
>>143490984
I'm shit at math so the answer is rape, always rape.
>>143490984
The answer is:
150 > Alpha > 30
>>143502176
Forget the last part.
>>143502176
This guy knows.
