
Kenneth S. answered 10/11/17
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
I don't see any figure. You do. Make a sketch and label all measurements that are available.
Obviously this problem relies upon triangle relationships...similar triangles.
It will be possible to write a proportion involving an unknown distance (you have to call it x, say) and corresponding known distances; "corresponding lengths of similar triangles are in proportion."