I need help with a geometry problem

label Mathematics
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schedule 1 Day
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Nov 7th, 2015

Thank you for the opportunity to help you with your question! Am really grateful and hope you find it helpful.

cosine=adjacent/hypotenuse

cos39=a/15

a=cos39*15

a=0.7771459615*15

a=11.6571894225

a=11.7[the answer is B]

Please let me know if you need any clarification. I'm always happy to answer your questions.REGARDS
Nov 7th, 2015

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