What is the formula for a rolling offset?

Offset=Square Root of Roll squared+ Rise squared

For Example:

To find the travel and run for a 45 degree rolling offset with a roll of 11.5 inches and a rise of 15.5 inches:

Solution Steps:

Offset= Square Root of 11.5 inches squared +15.5 inches squared

Offset= Square Root of 132.25 inches+240.25 inches

Offset= Square Root of 372.5 inches

Offset= 19.3 or 19 5/16 (closest 16th of an inch)