Here is a geometry problem, finding an angle.

Quite a few different ways to solve it.

Question

Here is a geometry problem, finding an angle.

Quite a few different ways to solve it.

anonymous · Answer

attachment

anonymous · Answer

I should probably say it's isosceles.

vishweshshrimali5 · Answer

Do you want to calculate D?

Right?

vishweshshrimali5 · Answer

I can help you

anonymous · Answer

Angle EDB, the    ?  in the diagram.

vishweshshrimali5 · Answer

Ok

anonymous · Answer

AB=AC???

vishweshshrimali5 · Answer

No I don't think that AB = AC !

anonymous · Answer

is it 55 degrees?

vishweshshrimali5 · Answer

But it would be better if we ask estudies

anonymous · Answer

how u got tat

anonymous · Answer

no wait, caught a mistake, one sec.

anonymous · Answer

bahrom7893 · Answer

Hey guys do you know any good GRE math prep books?

anonymous · Answer

Isosceles, AB = AC.

bahrom7893 · Answer

almost there..

anonymous · Answer

the answer feels like could be anything <.<

bahrom7893 · Answer

yea.. i got this matrix:
......
at the end it's like:
0 0 1 1|10
0 0 1 1|110

anonymous · Answer

ced +edb = 110

anonymous · Answer

there shud be sumthin else specified

bahrom7893 · Answer

no i got 4 eqns and 4 unknowns.. let me see if i made a mistake

anonymous · Answer

solved it

anonymous · Answer

im asking not telling

bahrom7893 · Answer

wait here let me show u..

bahrom7893 · Answer

1 0 1 0 | 160
 1 1 0 0 | 80
 0 0 1 1 | 90
 0 1 0 1 | 110

bahrom7893 · Answer

I just checked this matrix it is correct now let me check how i solved it cuz last time i got 
z+?=10
z+? = 110

bahrom7893 · Answer

yes that matrix is impossible to solve.. reduced row echelon form gives u a 0 row..

bahrom7893 · Answer

And I used every single piece of information on the graph..

bahrom7893 · Answer

Joemath do u know any good GRE math subject test review books?

anonymous · Answer

30

anonymous · Answer

@Tatiana Right answer, how about an explanation?

anonymous · Answer

I don't have it yet, but I try to find it

anonymous · Answer

How can u have an answer without an explanation?

anonymous · Answer

I have half, after that I have to solve trigonom equation

anonymous · Answer

If you haven't solved it, how do u know the answer is 30?

anonymous · Answer

I find it in Excel

anonymous · Answer

Better give me a bit time to solve equation

anonymous · Answer

equation $$\sin x*\sin80-\sin(20+x)*\sin40=0$$

anonymous · Answer

You need to explain where the equation comes from....

anonymous · Answer

ok

anonymous · Answer

attachment

anonymous · Answer

Be nice if someone could produce a geometric proof....

bahrom7893 · Answer

Very nice Tatiana_Stebko! How come my method did not work? But that is an elegant solution! Beautiful!