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Captcha...

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ursus:

--- Quote from: Cheese n' Ketchup on November 15, 2010, 07:34:22 PM ---


simple as fuck man, i freakin aced geom :)

--- End quote ---

Is angle DEB a right angle?

coolzeldad:
win :O

UberLord:

--- Quote from: gamefreak171 on November 15, 2010, 07:46:18 PM ---Is angle DEB a right angle?

--- End quote ---
Nope, it's an acute angle.
Why the hell can't I think of the answer I got one angle of the triangle figured out, but I'm having a block here, probably just need to sleep.

fenkeN:

--- Quote from: Cheese n' Ketchup on November 15, 2010, 07:34:22 PM ---


simple as fuck man, i freakin aced geom :)

--- End quote ---
I think I found it.
Its 60' Right?

Cheesicle:
Okay, I will explain.

The unnamed point in the middle shall be point F.

As we all know, a triangle has a total of 180 degrees.

and A and angle B are obviously 80 each. 80+80=160. 180-160=20. Therefore Angle C is 20 degrees.

Since the measure of angle DAE is already given to us, we add angle DAE to B and subtract that from 180. 20+20 = 40. 180-40=140. Angle AEC is 140 degrees.

Since angle A+B=110, 180-110=70, so angle AFB=70.

And since a line is 180 degrees, 180-70=110, so angle EFB=110.

Then according to the Vertical angle theory, angle DFA is congruent to angle EFB. So angle DFA also =110.

Now to find ADF, 110+20=130. 180-130=50 degrees.

Oshi- this is harder than I thought. D:

But according to http://www.aboluowang.com/life/data/2008/0826/article_24824.html , you will need to draw more internal lines in the triangle :\

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