Just confused on this

Question

Two buildings are 80 ft. apart across a street. A person on top of the shorter building finds the angle of elevation of the roof to the taller building to be 20°.  

If a wire is to be anchored at the top corners of the two buildings, as shown in the diagram, what would be the length of that wire? Round your answer to the nearest tenth.

Answer 1

cos 20 = 80/x

x = 80 / cos 20

= 85.134221798072971264765648177733