Đáp án:
Giải thích các bước giải:
the maximum points that you can put inside (or on) a circle to satisfy that the distance between 2 points is not smaller than the circle's radius is
để đạt được maximum points that the distance between 2 points is not smaller than the circle's radius
=> the distance between 2 points will equal to the circle's radius
=> the maximum point is 6