计算等边三角形外接圆面积的程序
外接圆是在其内刻有规则多边形的圆。内切圆的三角形是等边三角形。外接圆的面积可以使用以下公式找到，
外接圆的面积=“（a*a*（丌/3））”
代码逻辑，使用数学公式（a*a*（丌/3））找到等边三角形的外接圆面积。此代码中丌的值编码为3.14。该表达式被评估为浮点值。
示例
#include <stdio.h>
#include <math.h>
int main(){
int a = 5;
float area;
float pie = 3.14;
printf("Program to calculate area of Circumcircle of an Equilateral Triangle\n");
printf("The side of the triangle is %d \n", a);
area = ((pie/3)*a*a);
printf("The area of of Circumcircle of an Equilateral Triangle is %f \n", area);
return 0;
}输出结果
Program to calculate area of Circumcircle of an Equilateral Triangle The side of the triangle is 5 The area of circle inscribed inside a square is 19.625000