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Exterior Angle Of A Circle
An angle formed outside of the circle by the intersection of two secants, two tangents or a tangent and a secant is called an exterior angle of the circle.

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Interior Angle In A Circle
An interior angle formed by two intersecting chords has a measure that is the average of the intercepted arcs.

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Theorems About Tangent Chord Angle
Measure of the inscribed angle and measure of the tangent chord angle intercepting the same arc are equal.

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Tangent Chord Angle
The angle formed by a tangent to a circle and a chord is called tangent chord angle.

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Theorems About Inscribed Angles
Measures of the inscribed angles intercepting the same arc are equal.

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Inscribed Angle In a Circle
An inscribed angle is an angle APB formed by points A, P, and B on the circle's circumference.

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Central Angle In a Circle
A central angle is an angle AOB with endpoints A and B located on a circle's circumference and vertex O located at the circle's center.

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