The Trigonometry of Circles

Definitions and formulas for the arc and the arc length of a circle, sector and the area of the sector of a circle, the unit circle, the angles on the unit circle in radians, the angles on the unit circle in degrees, the points on the circumference of the unit circle
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 arc of a circle arc length of a circle sector of a circle area of a sector of a circle the unit circle points on the circumferenceof the unit circle

 An arc of a circle: An arc of a circle is a segment of the circumference of the circle. The formula for the arc length of a circle: Arc length of a circle in radians:Arc Length = Arc length of a circle in degrees: Arc Length =  A sector of a circle: A sector of a circle is a pie shaped portion of the area of the circle.  Technically, the piece of pie is between two segments coming out of the center of the circle. The area of a sector of a circle: Sector area of a circle in radians:Sector Area = Sector area of a circle in degrees: Sector Area =  