Question 1036034
I believe there is a typo. My guess is that you are looking for an angle that it's cos is 1/4 
To find answer, you may access this link
http://www.rapidtables.com/calc/math/Arccos_Calculator.htm
In the text box that says arc is type .25 and you will get an angle around 75. If the link above doesn't open, you may go to google and type arc is and search for a site that allows you to type .25 and then search for the angle.