Question

complete the following sentence. the figure below has rotational symmetry. ° is the smallest possible rotation that results in the figure being mapped onto itself.

Explanation:

Step1: 理解旋转对称概念

旋转对称是指图形绕着一个定点旋转一定角度后能与自身重合。

Step2: 分析给定图形

观察此图形，发现绕中心旋转180°能与自身重合，且180°是能使其重合的最小旋转角度。

Answer:

180