[URI Online Judge] – 1002 – Area of a Circle

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 <cstdio>

int main(){
double n;
scanf(“%lf”, &n);
printf(“A=%.4f\n”, n * n * 3.14159);

return 0;
}

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