The hexagon shape is used for radio coverage because ........

Explanation:

Answer: a
 The hexagon shape is used for radio coverage because the hexagon shape has equal distances anywhere and everywhere. However, before knowing that the hexagon shapes for cells are good for radio coverage. Once the circular cells and square cells were also used and when it gets clear that both cannot be used for radio coverage as both had some serious problems. The cellular cells failed because while connecting all towers and there is a gap between the circles, which creates a hollow. In which the radio-activity seemed almost none or very little. While on the other hand, the square cells failed because of the inconsistent distances in all directions. Thus the hexagon shapes cells overcome these problems. So the correct answer is A.