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System of angular measurement is known as

  • A.perimeter measure
  • B.chord measure
  • C.circular measure
  • D.quadrant measure

Answer: C

Circular measure is the system that measures an angle by the arc it subtends on a circle, divided by the radius - which is exactly the radian.

\[ \theta = \frac{\text{arc}}{\text{radius}} \]

It stands beside sexagesimal measure (degrees, minutes, seconds) as the other standard way of quantifying angles.

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