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Central Angle


An Angle having its Vertex at a Circle's center which is formed by two points on the Circle's Circumference. For angles with the same endpoints,


where $\theta_i$ is the Inscribed Angle.


Pedoe, D. Circles: A Mathematical View, rev. ed. Washington, DC: Math. Assoc. Amer., pp. xxi-xxii, 1995.

© 1996-9 Eric W. Weisstein