正多边形每个角:180(n-2)/n=180-360/n,
n是360的约数,360有约数1,2,3,4,5,6,8,9,10,12,15,18,20,24,30,36,40,45,60,72,90,120,180,360共24个,但n不能等于1,2,所以
正n边形的个数是22.
正多边形每个角:180(n-2)/n=180-360/n,
n是360的约数,360有约数1,2,3,4,5,6,8,9,10,12,15,18,20,24,30,36,40,45,60,72,90,120,180,360共24个,但n不能等于1,2,所以
正n边形的个数是22.