It is 180 degrees
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False.
the basics of construction is the back bine of geometry. you half to know how to do it. it is really important.
quarter turn = 90° half turn = 180°
No. Spherical geometry did not disprove Euclidean geometry but demonstrated that more than one geometries were possible. Different circumstances required different geometries. Similarly hyperbolic geometry did not disprove either of the others.
That depends on its application in science or geometry which has not been given. In science it can turn light into different colours and in geometry it can be in the form of a triangular prism.