What is the formula for finding the rolling offset with a tool of 12 inches and a rise of 18 inches?

The formula for finding the rolling offset involves using the Pythagorean theorem, which states that in a right triangle, the square of the hypotenuse (the longest side) is equal to the sum of the squares of the other two sides. In the context of the problem, you have a tool length (the horizontal run) and a rise (the vertical leg).

By applying the theorem, the rolling offset can be calculated with the formula: the square root of the sum of the squares of the rise and the tool length. This means that the roll (hypotenuse) is determined by calculating √(tool² + rise²).

Therefore, the option correctly represents this relationship and provides the accurate formula needed for calculating the rolling offset. Understanding this principle is vital for pipe fitters when determining the necessary lengths and angles during installations, ensuring proper fits and connections.