The length of the circle through the area of the circle
Problem
Write a program that calculates the length of a circle through the area of the circle.
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The circle length from the known area of the circle can be calculated by the formula :
\(L=\sqrt{S4\pi}\) ,
\(\pi\) - number of pi;
\(S\) - area of the circle.
You can use built-in constants to get the exact value of pi.
In
C++ you must write the following line at the beginning of your program
#define _USE_MATH_DEFINES
In
Python, you can use a constant from the math library
math.pi
Input format
Given an one real number - area of the circle
S (1 <= S <= 10
3).
Output format
Output the circle length.
Example
| N |
Input |
Output |
| 1 |
5.0 |
7.926654595212022 |