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Circle Theorems, Tangents, and Inscribed Angles

8th Grade · Math · Open Global Math

9 lessons

Goal

Prove and apply theorems regarding central angles, inscribed angles, chords, tangent lines, and cyclic quadrilaterals.

9 lessons
0 of 9 done
  1. Circle Definitions: Central Angles and Arc MeasuresUp next
  2. Inscribed Angle Theorem and CorollariesNot started yet
  3. Perpendicular Bisector of a Chord Theorem and ProofNot started yet
  4. Equidistant Chords and Congruent ArcsNot started yet
  5. Tangent-Radius Perpendicularity TheoremNot started yet
  6. Tangent Segments from an External Point TheoremNot started yet
  7. Circumscribed Angles and Inscribed Circle RelationshipsNot started yet
  8. Inscribed Quadrilaterals and Opposite Angle SupplementarityNot started yet
  9. Angles Formed by Tangents, Secants, and ChordsYou are here
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Learning standards covered

GlobalOGM.9.GEO.5Open Global Math Standards 2026™ · 8th Grade

Understand and apply the properties of circles (central angles, inscribed angles, chords, perpendicular chord theorem, tangent lines, tangent segments theorem, inscribed/circumscribed polygons, incenter, circumcenter).