I have a door lever which has a 90 deg. bend. I need to calculate the length that this lever would have to be if it were in the form of a straight rod, prior to being bent. I know I have all the input data, I'm just not sure how to express this algebraically. For example, I know that the inner radius of the bend is 0.416", and the outer radius is 0.892". Based on this data, how can I calculate the length of the lever prior to being bent? Thanks in advance!