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A regular hexagon is rotated [tex][tex]$360^{\circ}$[/tex][/tex] about its center. How many times does the image of the hexagon coincide with the preimage during the rotation?

A. 12 times
B. 1 time
C. 3 times
D. 6 times


Sagot :

To determine how many times a regular hexagon coincides with its preimage during a [tex]\(360^\circ\)[/tex] rotation, we need to analyze the symmetry of the hexagon.

### Step-by-Step Solution:

1. Understanding the Hexagon's Symmetry:
- A regular hexagon has 6 sides of equal length.
- Each angle between the sides in a regular hexagon is [tex]\(120^\circ\)[/tex].
- A regular hexagon is highly symmetrical and can coincide with its preimage multiple times when rotated about its center.

2. Rotational Symmetry:
- The hexagon can be rotated by certain angles and still look the same, coinciding with its original position.
- Specifically, a regular hexagon coincides with its preimage every time it is rotated by [tex]\(\frac{360}{6} = 60^\circ\)[/tex].

3. Calculating All Possible Coincidences:
- The hexagon coincides with its preimage at [tex]\(0^\circ\)[/tex] (no rotation).
- Additionally, it coincides at rotations of [tex]\(60^\circ, 120^\circ, 180^\circ, 240^\circ,\)[/tex] and [tex]\(300^\circ\)[/tex].

Thus, the angles [tex]\(0^\circ, 60^\circ, 120^\circ, 180^\circ, 240^\circ,\)[/tex] and [tex]\(300^\circ\)[/tex] are the instances where the hexagon coincides with its preimage within a full [tex]\(360^\circ\)[/tex] rotation.

4. Counting the Coincidences:
- Including the starting position, there are a total of 6 instances where the hexagon coincides with its preimage during a full [tex]\(360^\circ\)[/tex] rotation: [tex]\((0^\circ, 60^\circ, 120^\circ, 180^\circ, 240^\circ, 300^\circ)\)[/tex].

Therefore, the hexagon coincides with its preimage 6 times during a [tex]\(360^\circ\)[/tex] rotation.

Thus, the correct answer is:
[tex]\[ \boxed{6} \][/tex]