Question 198827
If this "inclination" means, angle of elevation, then starting with the diagonal on the floor from nerdybill's solution, 17 is the length of the "leg" on the floor, and the other leg, from floor to height of the cieling is given as 3.


From one corner on the floor, to the opposite corner on the ceiling, the right triangle is formed,  legs 17 on the floor, 3 from floor to ceiling.  The angle of elevation is  some x,  {{{tan(x)=3/17}}}.
{{{x=arctan(3/17)}}}
{{{highlight(x=10*degrees)}}}