The bridge will span a section that is 35 meters wide, with ends of the bridge set back 2.5 m from each river bank. The engineer must apply right angle relationships because one river bank is 9 m higher than the other.

Question

What is the final length of this bridge?

Answer 1

so the total horizontal span of the bridge is 40m, with one end 9m higher.
The final length z of the bridge is thus
z^2 = 40^2 + 9^2