



 
Hi, Here is my diagram of the situation you describe. 7 The control tower is at C, the aircraft is at A, P is on the ground directly below the aircraft and Q is 10 km west of C and 5 km south of P. The angle QC is a right angle and hence you can use Pythagoras' theorem to find the distance from P to C. The angle APC is a right angle also so you can use Pythagoras' theorem again, this tim on triangle APC. I hope this helps,  


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