SOLUTION: 22.7 ft (cos (15 degrees 20 minutes 10 seconds)). I understand the math...but cannot put it in the calculator to get the correct answer of 21.89 ft. I am using a sharp EL-501X sc

Question 788802: 22.7 ft (cos (15 degrees 20 minutes 10 seconds)). I understand the math...but cannot put it in the calculator to get the correct answer of 21.89 ft. I am using a sharp EL-501X scientific calculator. Maybe I actually don't know how to do the math...When I convert the degrees/minutes/seconds either by hand or on my calculator I get 15.33611111 then I hit cos and it gives me a -0.931655977. Then I multiply that by 22.7 and I get -21.1485907. But the teacher says it is 21.89

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
22.7 ft (cos (15 degrees 20 minutes 10 seconds)). I understand the math...but cannot put it in the calculator to get the correct answer of 21.89 ft. I am using a sharp EL-501X scientific calculator. Maybe I actually don't know how to do the math...When I convert the degrees/minutes/seconds either by hand or on my calculator I get 15.33611111 then I hit cos and it gives me a -0.931655977. Then I multiply that by 22.7 and I get -21.1485907. But the teacher says it is 21.89
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Ans: 22.7*cos(15+(20/60)+(10/3600)) = 21.8917
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Cheers,
Stan H.
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