Round Metal Duct Runs Along Side Some Stairs from the Floor

Multiple Choice

Round metal duct runs along side some stairs from the floor to the ceiling. If the ceiling is 8.00 ft high and the angle of elevation between the floor and duct is 36.0 ^o, how long is the duct? Round your answer to the appropriate number of significant digits.

A) 13.6 ft
B) 12.0 ft
C) 12.5 ft
D) 12.7 ft
E) 15.3 ft