anonymous
  • anonymous
an airplane leaves an airport and flies due west 170 miles and then 180 miles in the direction 190˚10'. assuming the earth is flat, how far is the plane from the airport at this time(to the nearest mile)?
Precalculus
schrodinger
  • schrodinger
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TheRealMeeeee
  • TheRealMeeeee
ok
TheRealMeeeee
  • TheRealMeeeee
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TheRealMeeeee
  • TheRealMeeeee
isnt it c^2 = a^2 +b^2

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TheRealMeeeee
  • TheRealMeeeee
here, the angle C is 39.17+90, and u have a, b, only c left to find, which is the answer
TheRealMeeeee
  • TheRealMeeeee
replace them in a2 + b2 - 2ab cos(C) = c2 to find c
TheRealMeeeee
  • TheRealMeeeee
120 mi150 mi39.17
dumbcow
  • dumbcow
|dw:1386014079832:dw| use Law of cosines to find "x"

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