What is pi x 23.5 squared?

first you do 23.5 X 23.5 (square it) which is 552.25. Then you multiply by pi. If your calculator has a pi button, use it, but if not, round to 3.14. 552.25 X 3.14 = 1734.065 If you have a pi button, you should get 1734.94454294496. Because Pi is irrational, even this is rounded. The easier way to use pi is 3.14 because you a most likely not expected to go out 20 decimal places for pi.