Trigonometry. How do I solve this?

Question

ahsome · Answer

Which angle are you trying to find?

anonymous · Answer

and the ditsnce from d to c is 15m. im tying to find the distnce from a to b. =)

ahsome · Answer

Assuming the shape is not a rectangle

anonymous · Answer

Okay..

ahsome · Answer

Hmm... Where is the right angle?
The botom left angle is $160+59=219$
The bottom right angle is $108+13=121$

ahsome · Answer

Anybody know there the $Right-Angle$ is?

anonymous · Answer

Nah im sorry no idea.

anonymous · Answer

Really sorry

ahsome · Answer

Its OK, your question ;)
We need a right-angle triangle to use Trigonomatry, but I can't find any 90 degree angle.

anonymous · Answer

can we use theta= 180- (angle1 + angle2)?

anonymous · Answer

no haha

ahsome · Answer

But what will that give us?
To find length, we need to use:
$$sin\theta=\frac{Opposite}{Hypotnuse}$$
$$cos\theta=\frac{Adjacent}{Hypotnuse}$$
$$tan\theta=\frac{Opposite}{Adjacent}$$
But in all cases, we need a 90 degree angle.

anonymous · Answer

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