A lighthouse is located on an island 350 feet from the shore of the mainland as shown. If x=0.41 rad, what is D?
Now, let X= 0.41

Answer: d = 382
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Work Shown:
d = 350*sec(x)
d = 350*(1/cos(x))
d = 350*(1/cos(0.41))
d = 381.62910632113
d = 382
Make sure your calculator is in radian mode.