Sec 3/4 E Math T07-Q04 - A three-dimensional trigonometry problem

A vertical flagpole of height \(16\) m stands at one corner of a rectangular field measuring \(50\) m by \(18\) m.

1. Calculate the diagonal length of the field.
2. Calculate the angle of elevation of the top of the flagpole from the opposite corner, giving your answer correct to 1 decimal place.