IM2.7 T3 Centers of Rotation 2

Multiple points
Triangle A'B'C' below is a rotation of triangle ABC. Use what you learned in the last task to find the center of rotation. Leave any constructions visible to illustrate your method. [i]Hint: Try to use circles in your constructions.[/i]
Describe how to find the center of rotation for figures made up of multiple points. Try to use the words [b]perpendicular bisectors, intersection, concentric circles, corresponding, image, pre-image, equidistant [/b]in your description.
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