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It is a portion of the circumference of a circle.
In linear units, not degrees.
Arc length = (central angle/360) * circumference.
Arc measure equals the measure of its central angle.
Area = (central angle/360) * area of the circle.
The sector represents half of the circle's area.
The region bounded by a chord and the arc subtended by the chord.
Area of segment = area of sector - area of triangle.
Circumference = 2πr.
A larger radius results in a longer arc length for the same central angle.
Central angle = (arc length/circumference) * 360.
A region bounded by a central angle and its intercepted arc.
Area = πr².
The area of a sector is proportional to its central angle.
It increases the area of the sector.
Arc length = (central angle/360) * 2πr.