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Posted by **mellisa** on Wednesday, February 1, 2012 at 9:31pm.

- math,geometry -
**Marney**, Wednesday, February 1, 2012 at 9:52pmFind 3 upper case letters that look the same when rotated 180 degrees. Then, what letter's 90, 180, and 270 degree rotations has this outline? This is also the inside lines formed by the rotation of what letter? and could explain how you did it please i really want to be able to understand it rather then just know the answer.

- math,geometry -
**Anonymous**, Thursday, February 2, 2012 at 12:44amRotated in the plane of the paper, or rotated around an axis in the paper?

A is unchanged if rotated around a vertical axis in the paper.

B is unchanged if rotated around a horizontal axis in the paper.

Z is unchanged if rotated around an axis perpendicular to the paper

H can be rotated around any of the three axes and remain unchanged

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