CK-12 Geometry-Concepts

http://www.ck12.org Chapter 9. Circles

10.

11.

12. Prove the Intersecting Chords Angle Theorem.

Given: Intersecting chordsACandBD.

Prove:m^6 a=^12

(

mDĈ+mAB̂

)

Fill in the blanks.

13. If the vertex of an angle is __ a circle, then its measure is the average of the -
    _____ arcs.


14. If the vertex of an angle is ____ a circle, then its measure is __ the intercepted arc.


15. Can two tangent lines intersect inside a circle? Why or why not?