



 
Hi Andrew, I drew a diagram of want you described. $AD$ is parallel to the ground and $CD$ is perpendicular to the ground so that triangle $CDA$ is a right triangle. $AB = DC = 70$ feet and the measure of the angle $DAC$ is $\large \frac{30}{2} \normalsize = 15$ degrees. $AD = BC$ is the length required. What trig function relates the measure of the angle $DAC$ to $DA$ and $CD?$ Penny  


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