Question

a)    Make a program to find the diameter d=2r and area=4Πr2 or 4 pie r square of the sphere. Value of ‘r’ should be defined by the user.

Answer 1

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


int main()
{
    float r;
    float d;
    float S;
    
    printf("Please, enter the radius of the sphere:  ");scanf("%f", &r);
    
    d=2*r;
    S=4*3.14*pow(r,2);
    
    printf("\nDiameter Of the sphere is: %g", d);
    printf("\nArea Of the sphere is: %g", S);
    
}