document.write( "Question 56305This question is from textbook
\n" ); document.write( ": A pilot, attempting to fly from Middletown to Westburg, a distance of 200 miles, notices after flying 180 miles that Westburg us still 35 miles away because the heading was off by a few degrees. How many degrees was the heading off the desired course (to one decimal place)? \n" ); document.write( "
Algebra.Com's Answer #38261 by ankor@dixie-net.com(22740)\"\" \"About 
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A pilot, attempting to fly from Middletown to Westburg, a distance of 200 miles, notices after flying 180 miles that Westburg us still 35 miles away because the heading was off by a few degrees. How many degrees was the heading off the desired course (to one decimal place)?
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\n" ); document.write( "This would form a triangle with sides a = 180, b = 35, c = 200
\n" ); document.write( "Angle B would be the heading error in degrees.
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\n" ); document.write( "Use the law of cosines to find angle B:
\n" ); document.write( "Cos(B) = (c^2 + a^2 - b^2)/(2c*a)
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\n" ); document.write( "Cos(B) = (200^2 + 180^2 - 35^2)/(2*200*180)
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\n" ); document.write( "Cos(B) = (40000 + 32400 - 1225)/72000
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\n" ); document.write( "Cos(B) = 71175/72000
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\n" ); document.write( "Cos(B) = .98854
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\n" ); document.write( "B = 8.7 degrees\r
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