Question:C program for area of a sphere 

Answer 
#include<stdio.h>
#include<math.h>

int main(){

    float r;
    float surface_area,volume;

    printf("Enter radius of the sphere : ");
    scanf("%f",&r);

    surface_area =  4* M_PI * r * r;
    volume = (4.0/3) * M_PI * r * r * r;

    printf("Surface area of sphere is: %.3f",surface_area);
    printf("\nVolume of sphere is : %.3f",volume);

    return 0;
}
Sample output:
Enter radius of the sphere: 5
Surface area of sphere is: 314.159
Volume of sphere is: 523.599 

+ ExplanationNot Moderated
Formula of surface area of sphere:
Surface_area = (4 * Pie * (r*r))Formula of volume of sphere:
Volume = ((4/3) * Pie * (r*r*r))
Pie = 22/7 or 3.14159265358979323846264338327950288419716939937510...

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