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Angle Relationships in Circles EMS 514

Central Angles

A central angle is an angle that originates from the center of a circle.

Inscribed Angles

An inscribed angle in a circle is an angle in a circle where the vertex is on the circle and its sides are chords.

Angles Inside a Circle when Secant Lines Intersect

A secant is a line that intersects a circle at two points. Look at the following image displaying the intersection of two secants inside a circle.

Quadrilateral Inscribed Inside a Circle