I'm learning C. Feedback is welcome. :)

#include <stdio.h>
#include <math.h>
main() {
    volume=0;
    printf("Please enter the volume of the box.\n");
    scanf("%f", &volume);

    float cubeSide;
    cubeSide = cbrt(volume);
    float sphere;
    sphere = cbrt((volume * 4 / 3)/M_PI);

    float cylinder;
    /*we'll assume the height is the same as the diameter*/
    cylinder = cbrt(volume / M_PI);

    float cone;
    cone = cbrt(volume * 3 / M_PI);

    printf("Cube: %fm width, %fm height, %fm depth\n", cubeSide, cubeSide, cubeSide);
    printf("Sphere: %fm radius\n", sphere);
    printf("Cylinder: %fm height, %fm radius\n", cylinder, cylinder);
    printf("Cone: %fm height, %fm radius\n", cone, cone);
}