circle

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Algorithm

Step 1: Begin

Step 2: Read radius

Step 3: area = 3.14 * radius * radius

Step 4: Print area

Step 5: End

Flowchart

Program

/*calculate the area of a cicle*/
#include
#include
void main()
{
float area,radius;
clrscr();
printf("enter radius of a circle");
scanf("%f",&radius);
area=3.14*radius*radius;
printf("Area of a circle is %f",area);
}

Illustration of the program:

Variables area is used for area of a circle and radius used for radius of a circle.

If you entered 6 as radius, area of a circle is 3.14 * 6 * 6 = 113.04

So, the output is

Area of a circle is 113.040000

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