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Mathematics 7 Online
OpenStudy (anonymous):

Judging from appearance, tell whether each figure has rotational symmetry. If so, what is the angle of rotation? If not, explain https://www.connexus.com/content/media/102878-7202005-33203-PM-478299365.gif Yes: 90° Yes; 180° Yes; 270° No, you cannot rotate the figure 180° or less so that its image matches the original figure.

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