Mathematics, 12.09.2019 20:10, P05182010

Which transformation will always map a parallelogram onto itself?
o a.
a 90° rotation about its center
a reflection across one of its diagonals
ob.
o c.
a 180° rotation about its center
od.
a reflection across a line joining the midpoints of opposite sides

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Which transformation will always map a parallelogram onto itself?
o a.
a 90° rotation a...