Where did I go wrong?

Question

https://code.sololearn.com/cpIqMZ7ogwY7/?ref=app

Answer 1

You access member variable via self.member...
So it is not radius.self but self.radius..
Also in def calculate() it must be self.radius..

https://code.sololearn.com/cch26RYe3FZ3/?ref=app

Answer 2

brother I have a request

Answer 3

Okay :)
What is your request?

Answer 4

Hey G B may I know your email address because I am unable to send you messages? If you believe me.