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Central Angle of a circleCentral Angle and Arc Length The central angle of a circle is the angle based at the circle's center. In other words, the vertex of the angle must be at the center of the circle. A central angle is formed by two radii that start at the center and intersect the circle itself.
Related Pages: Circles forumula, graph, equations | Equation of A Circle | Circumference | Area | Chord | Tangent |Arc of A Circle | Intersecting Chords |Inscribed Angle |Secant of circle | 2 Tangents from 1 point |Central Angle | Angles, Arc, Secants, tangents |Tangents, Secants and Side Lengths | Tangent and a Chord | images Free Math Printable Worksheets:  Circles Worksheets and Activites for Math Teachers
The middle circlein the picture below depicts a central angle because this angle's vertex rests on the center of the circle.
 Interactive Arc and Central Angle |
Graphing Calc
