Hi ya,
Let x = distance between towerA and the fire
=> x = 12*cos(42.3)
=> x = 8.876 (correct to 3 decimal places)
let y = distance between towerB and the fire
=> y = 12*cos(61.7)
=> y = 5.689 (correct to 3 decimal places)
Here's a handy page on the use of SohCahToa - http://www.mathsisfun.com/sine-cosine-tangent.html
I hope this helps and good luck! If you have more questions - ask away!
Many Thanks Don.
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