圆的周长的计算。)A)J4U)}4U'd(h*H0W0k-[/v1~4F
)A)J4U)}4U'd(h*H0W0k-[/v1~4F
算式：提示0h;|1T*M+x,b1o9D(H*i:R)A)J4U)}4U'd(h*H0W0k-[/v1~4F
答：周长是)p)d;f5_7y厘米。)A)J4U)}4U'd(h*H0W0k-[/v1~4F