tan(30)=.5773502692
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The answer is 0.2867.
1.732
tan-1(0.6009) =31.0016578 degrees
10 x tan(51) = 12.349 (rounded) tan(510) = negative 0.5774 (rounded)
When the angle of elevation equals 45 degrees. tan-1(1) = 45 degrees.