Language C
Description It calculates the area of a circle using the formula: A = π * R²
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#include <stdio.h>
#include <stdlib.h>
#define _USE_MATH_DEFINES
#include <math.h>

int main (void)
{
    float area, radius;
    printf ("Enter the value of radius: ");
    scanf ("%f", &radius);
    (void) getchar ();
    area=M_PI*radius*radius;
    printf ("Value of area: %g\n", area);
    putchar ('\n');
    system ("pause");
    return EXIT_SUCCESS;
}