1. ## interesting question

Angle BAC =60 degrees
Angle BDC=150 degrees
|DB|=12
|DC|=5
|DA|=x

2. ## Re: interesting question

I solved this question.
Who can solve this without trigonometry?
clue:equilateral triangles.

3. ## Re: interesting question

Solve WHAT? I see no question.
You need another coffee!

One question for you: what is length of BC?

4. ## Re: interesting question

OK: did you mean ABDC is a quadrilateral?

Do those funny looking symbols on
AB and AC mean AB = AC?

What does the symbol on right of 150 mean?

If AB = AC and angle BAC = 60,
why did you not simply state:
ABC is an equilateral triangle?

5. ## Re: interesting question

Yes AB=AC
It is 150 degrees.It is degree symbol.

6. ## Re: interesting question

I liked the question and solution. I posted it by this reason. I have the answer and it is fun to solve.