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 is the Inscribed Angle.

**References**

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

© 1996-9

1999-05-26