Please I need more explanation on dis Nd solution

Question

During your math class, you are given a task to calculate the perimeter of a circle.
You decide to write a small program that will take the radius as input, and will calculate and print the perimeter for you.
The value for π (pi) is already defined.

Sample Input
4

Sample Output
25.12
https://www.sololearn.com/discuss/2759255/?ref=app

Answer 1

The value of perimeter is 2*Pi*r
You have already given the value of PI and r.
so just print 2*Pi*r .