输入边长计算正六边形的面积和周长

Question

C语言输入正六边形的边长，求其面积和周长保留四位小数请求，Area=3x根号3÷2×a

Answer 1

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

int main()
{
    double a;
    double ar;
    scanf("%lf",&a);
    ar = 3.0*sqrt(3.0)*a*a/2;
    printf("Area = %.4f\n",ar);
    printf("Perimeter = %.4f\n",a*6.0);
    return 0;
}