Write a program to read the radius of a circle and to compute its area and circumference. Use a symbolic constant to define the value of π.

/* Write a program to read the radius of a circle and to compute its area and circumference. Use a symbolic constant to define the value of pie */ #include<stdio.h> #include<conio.h> #define pi 3.1428 int main() { float a,c,r; printf("Enter the value of radius:\n"); scanf("%f",&r); c = 2*pi*r; a = pi*r*r; printf("Circumference of circle is %.2f.\nArea of circle is %.2f.",c,a); getch(); return 0; }

**Output**

For a radius 5, circumference = 31.43 and area = 78.57

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