The circle is the reflex angle, the square means it's a right angle.
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A Circle
The properties associated with the angles of a circle is the amount of rotation about the point of intersection of two lines in order to make one line into correspondence with the other. The arc of a circle consists of two points on the circle and all of the points on the circle lie between those two points.
a square
A square and rectangle.
Diagonally opposite angles of a rectangle or square is one example.