Translation of "circled" into Chinese

I really like him, but not his circle of friends.

我真的很喜歡他, 可是我不喜歡他周圍的朋友。

You can figure out the circumference of any circle, regardless of its size, by multiplying its diameter by pi.

只要是圆形,无论大小,只要你把直径乘以π,就能得到圆周有多大。

We must break that vicious circle and establish a virtuous circle that ensures a more promising future for the affected countries.

我们必须打破这种恶性循环,建立起良好循环,确保受影响国家拥有一个更光明的未来。