Marilyn vos Savant answers the question ....
(Reprinted with permission from PARADE and Marilyn vos Savant, copyright © 2003.)
You will need them every day, I hope, without knowing it. Geometry is beautifully logical, and it teaches you how to think and prove that things are so, step by step by step. Proofs are excellent lessons in reasoning. Without logic and reasoning, you are dependent on jumping to conclusions or - worse - having empty opinions.