C program to find an area of octagon.

 

01  #include<stdio.h>
02 #include<math.h>
03
04 int main()
05 {
06 int side;
07 float area;
08
09 printf("nEnter the Length of the Side : ");
10 scanf("%d", &side);
11
12 area = 2*(1+sqrt(2))*side*side;
13
14 printf("nArea of Regular Octagon : %.2f", area);
15 return 0;
16 }
 
 
OUTPUT :

Enter the Length of Side : 3
Area of Regular Octagon : 43.46

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