360 degrees
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A complete rotation of a ray around a point is 360 degrees or pi radians. That defines the two common units of measuring angles. The measurement of an angle is the number of such units between the two rays which form the angle.
This is the definition of an inscribed angle in geometry. An inscribed angle is formed by two chords in a circle that also share a common point called the vertex.
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The point of an angle is its vertex
a right angle is an angle that is 90 degrees