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ANGLES
There are\[360\,^{\circ}\]in a complete turn.
There are \[180\,^{\circ}\]in half a turn (ie a straight line)
a
b
a . 4 right angles and 4 lines of symmetry
one pair of parallel
Opposite Angles are equal
Co-interior angles = \[180\,^{\circ}\] ("C")
