Hi Please help I'm really confused!!

Jul 2015
Boston, MA
Hi! I really just don't get this question and I'm so stuck on it; i just cannot figure it out. Please help me!!
Here it is:

A pilot in a helicopter sights an ambulance heading toward an accident scene. He measures the angles of depression to the ambulance and the accident to be 21° and 15°, respectively. If the helicopter is 4000 ft from the ambulance, how far does the ambulance have to travel to get to the accident?

Thanks so


MHF Helper
Sep 2012
Hey lolhelpme.

The first thing I would recommend is to draw the diagram you have. You should have a triangle with one line representing the road or a straight line that has the ambulance and accident. You know two angles and a side which is enough to know a triangle and you can use results like the sine rule or cosine rule to get other angles or sides of a triangle given that you know the others.

Do you know the sine and cosine rule for triangles?
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