ABC is a quadrilateral. Angle BAC =60 degrees Angle BDC=150 degrees |DB|=12 |DC|=5 |DA|=x
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I solved this question. Who can solve this without trigonometry? clue:equilateral triangles.
I see no quadrilateral. Solve WHAT? I see no question. You need another coffee! One question for you: what is length of BC?
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?
Yes AB=AC It is 150 degrees.It is degree symbol.
I liked the question and solution. I posted it by this reason. I have the answer and it is fun to solve.
Ad = 13
Yes.
How did you find AD ?