Given :
A pipe can make with the horizontal. the minimum angle being 1/4 inch the maximum angle being 1/2 inch .
To Find :
The minimum and maximum angles to the nearest tenth of a degree that a pipe can make with the horizontal.
Solution :
Angle
is given by :

Now , minimum angle is given by :

For maximum angle :

Therefore , minimum and maximum angle is 1.146° and 2.291° respectively .
Hence , this is the required solution .