so, you're trying to find the hypotenuse. This is called the pythagorean theorem. you're going to use a squared plus b squared equals c squared.
11=a squared
60= b squared
put that into a equation.
you'll get:
121+3600= c squared
3721=c squared
find the square root of 3721, finding the square root will get rid of the squared sign by the c
the square root of 3721 is 61
61=c
hope this helps!!