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Tangents, Secants, and Angle Relationships
Geometry · 9th Grade · Circles · Quarter 4

Tangents, Secants, and Angle Relationships

Learn to calculate the measures of angles formed by the intersection of tangents and secants. The location of the intersection, whether inside, on, or outside the circle, determines the relationship used.

Common Core State StandardsCommon Core State Standards: Geometry - Circles - Understand and apply theorems about circles

About This Topic

Learn to calculate the measures of angles formed by the intersection of tangents and secants. The location of the intersection, whether inside, on, or outside the circle, determines the relationship used.

Key Questions

  1. Analyze how to find the measure of an angle formed by two intersecting chords inside a circle.
  2. Explain the formulas for finding angle measures when two secants, two tangents, or a secant and a tangent intersect outside a circle.
  3. Compare the different angle relationships based on where the vertex of the angle is located relative to the circle.

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Edited by Adriana Perusin, Editor-in-Chief, Flip Education