Uri problem 1002 solve

Problem :

Area of a Circle

Adapted by Neilor Tonin, URI  Brazil

Timelimit: 1

The area of the circle is defined as A = π . R2, having π as 3.14159.

Calculate the area using the formula given in the problem description.

Input

Read the variable R (double precision), that is the radius of the circle.

Output

Print the variable A, rounded to four decimal digits.

Sample Inputs	Sample Outputs
2.00	A=12.5664

100.64

A=31819.3103

150.00

A=70685.7750

Solution:

#include <stdio.h>

  

int main() {

  

double A , R;

    scanf("%lf",&R);

    A=3.14159*(R*R);

    printf("A=%.4lf\n",A);

     

    return 0;

}