Does anyone else use the method of approximation in maths, allow me to give an example, if I’m trying to figure out 128 = 3.14 times r squared I would first assign a number to r, can be any number within reason of course so let’s start with 10 so now I go 10 square = 100 so 3.14 times 100 would be 314 can’t be that and the number must obviously be lower to achieve 128 so now I assign 5 to r so 5 squared is 25 than 3.14 times 25 would be 78.5 can’t be that so it must be higher than I’ll slowly work my way to the right number, I was just wondering if anyone else uses this