Homework Help: Pre-Calculus-Trig

Posted by Chloe Mack on Sunday, January 30, 2011 at 7:52pm.

A pole tilts 12 degrees from the vertical, away from the sun, casts a 34 foot long shadow on level ground. The angle of elevation from the end of the shadow to the top of the pole is 64 degrees. How long is the pole?

Pre-Calculus-Trig - Henry, Monday, January 31, 2011 at 9:46pm
Using the Law of Sines,

L / sin64 = 34 / sin(90-12),
L / sin64 = 34 / sin78,
Multiply both sides by sin64:
L = 34sin64 / sin78 = 31.2ft = Length
of pole.

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