If pitcher faces home plate, thru what angle must he turn to

[jshaziza]

A Major League baseball diamond is a square 90 feet on a side. The pitching rubber is located 60.5 feet from home plate on a line joining home plate and second base. How far is it from the pitching rubber to first base? If a pitcher faces home plate, through what angle does he need to turn to face first base?

I am confused with what they want and mean in the last sentence. Could someone please clarify it for me. Thx. for your help.

 

[jshaziza]

Thx. for your help man, but I am a little bit confused: if angle c=45 degrees shouldn't angle A also equal 45 degrees since they both cut in half a 90 degree angle?