CK12 - Geometry

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16. Proof


17. Proof


18. Righttrapezoid;

Arc Measures

LearningObjectives

• Measurecentralanglesand arcs of circles.


• Find relationshipsbetweenadjacentarcs.


• Find relationshipsbetweenarcs and chords.

Arc, CentralAngle

In a circle,thecentralangleis formedby two radii of the circlewith its vertexat the centerof the circle.An
arcis a sectionof the circle.