1279 replies to this topic

[Stars]

*smacks forehead*

 

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Is it 70, Panda?

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Do you seriously just flip that 70-60-50 triangle at the bottom around to get the angles for the triangle above it?

 

EDIT: No, nevermind. I'm certain it's smaller than that. I'm just either over-thinking this or I'm too tired to see the solution.

[Glaciermage]

Ah well then I say

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40

What a frustrating problem, Panda. :)

[panda]

Hmm. Maybe shouldn't have posted this close to midnight. No, you don't just flip a triangle. Please note that the triangle is not drawn to scale and work needs to be shown to justify a correct answer.

 

Hint: congruence.

[lazlo falconi]

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We'll call the point where lines BD and AE intersect as point F.

If angle FAB is 70 and angle ABF is 60, then angle AFB must be 50. If angles A and B are 80 degrees, angle C must be 20. If angles C and and DBC are 20, then angle CDB must be 140. Assuming that, angle DEC is


Wait


I was about to do way too much work.

Angle AFB is 50, which makes angle DFE 50, and thus angles DFA and EFB 130.
Angle AEB must be 30, which would make angle AEC 150.

Angle CDB is 140, and angle AEC is 150.

Beyond this, though, I don't think there is enough information to support the answer that x is 40.

[Stars]

Lazlo seems to be at the same point I got stuck at last night. I'll look at this again when I'm not getting ready for class.

[panda]

Star of Threads, er...Lazlo...um, Shuckle? (Would you people please just pick a name and stick with it?)

 

Anyway, you there, cat, you have a great start. There is enough information to complete the problem, but the answer is not

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40

.

 

Glace, show your work.

 

Hint: you may have to "invent" some numbers to complete the problem. That's in quotes because you don't just make the numbers up, as they are already there (just hidden  ).

[SpazCat]

All of my work is on a graph paper on my desk. I am lazy and don't care enough to scan it in and upload it.

 

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60, but I know it's wrong. I got all mad at it.

 

The idea is that every triangle equals 180 degrees. The same applies to the flat lines, those equal 180 degrees as well. I can't remember what the theorem is called, but I do remember that for crossing lines if one equals 50 the opposite angle also equals 50. From there you can gather the other two angles by subtracting 50 from 180.

 

The key is to figure out all the triangles you can with the degrees given before number crunching the rest. Once you figure out one it's pretty much a cascade of answers from there.

[SpazCat]

Hint: you may have to "invent" some numbers to complete the problem. That's in quotes because you don't just make the numbers up, as they are already there (just hidden  ).

 

I do have 140 that I have to split and the same with 150. I was stuck there one guessing how to split the numbers since there are multiple solutions from those two numbers.

[panda]

Hint: The numbers you have to "invent" are not the angles.

 

Oh my, I've said too much.

[kspr]

who saw Mars last night?

[SpazCat]

Hint: The numbers you have to "invent" are not the angles.

 

Oh my, I've said too much.

 

That was quite literally all I needed to break this one. This time I included my work:

 

The lighter lines are the ones I added, as well as the lighter numbers. The darker lines/numbers were the given items.

 

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EDIT: Solving for Triangle ABC, ABE, & AED was a matter of 180 minus the other two angles. I got stuck at angle CDB & CDB (as it looks like others did too). After your hint I realized that I didn't have enough triangles to get the info I needed. Thinking about the congruent angels in the center I then realized reflections were the way to go! From there is was just a matter of 180 minus angles I had the answer too.

 

 

who saw Mars last night?

 

I can't say that I did.

[lazlo falconi]

who saw Mars last night?

I wanted to, but the night kind of got away with me and I stayed inside working on a math problem.

[kspr]

the next best night is april 14th, it will be the brightest object in the eastern sky, ten times more bright than any of the other stars.

[panda]

Sorry, Spaz.

You actually don't need to draw any new lines.

[Puffin]

You're all neeeerrrrrrrds.

 

aka, I suck at math and I am so not even attempting this.

[legacyme3]

Ugh can we talk about something other than math?

 

Like uh

 

Shit. I got nothing.

[SpazCat]

Sorry, Spaz.

You actually don't need to draw any new lines.

 

 

So I didn't get it right...?

 

I have spent enough time on it. And if your hint was a lie I hate you.

 

New topic: Math is the devil.

[SpazCat]

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Okay, I looked over it again... this time with no extra triangles.... x=20 degrees?

[Glaciermage]

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210 final answer

[Monkeydog]

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210 final answer

Not sure if serious.