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Geometry 13 Online
OpenStudy (anonymous):

How many degrees did i rotate this triangle? In which direction (clockwise, counterclockwise) did it move?

OpenStudy (anonymous):

OpenStudy (mathmate):

You will find that CGW is clockwise, and C'G'W' is counter-clockwise. So it takes a reflection and a translation, instead of a rotation. In general, if it were a rotation, you just have to join CC', GG' and WW'. The midpoints of these lline segments should be concurrent at the centre of rotation.

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