A 180 Degree shape would be a line a straight line or diagnal like this:
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Yes, if you turn a shape completely around to its original position it will look like its original position because it will be in its original position. For example if i take a trapezoid and turn it 180 degrees it does not look the same as it did before so it does not have rotational symmetry of 180 degrees.
Two angles put together to create a 180 degree angle.Supplementary angles add up to 180 degrees as for example the supplementary angle of 120 degrees is 60 degrees because 120+60 = 180 degrees.
there is 180 degree in a half turn
Picturing a clock face, a 180 degree angle appears as if the time was 6:00.
A pair of supplementary angles total 180 degrees. In this instance, the supplement to a 65 degree angle would be 180 - 65 = 115 degrees.