(Solved): To determine the distance between two aircraft, a tracking station continuously determines the dist ...

To determine the distance between two aircraft, a tracking station continuously determines the distance to each aircraft and the angle $A$ between them (see figure). Determine the distance $a$ between the planes when $A=45^{?},b=33$ miles, and $c=18$ miles. (Round your answer to one decimal place.) $a=\mathrm{mi}$