CK12 - Geometry

16.

17.

18.

19.

20. 
    

    The centeris locatedat , radius=.

    
    


21. 
    

    The centeris locatedat , radius=.

    
    


22. 
    

    The centeris locatedat , radius=.

    
    


23. 
    

a. Yes

b. No

c. No

d. Yes

TangentLines

LearningObjectives

• Find the relationshipbetweena radiusand a tangentto a circle.


• Find the relationshipbetweentwo tangentsdrawnfrom the samepoint.


• Circumscribea circle.


• Find equationsof concentriccircles.

Introduction

In this sectionwe will discussseveraltheoremsabouttangentlines to circlesand the applicationsof these
theoremsto geometryproblems.Rememberthat atangentto a circleis a line that intersectsthe circleat
exactlyone pointand that this intersectionpointis calledthepointof tangency.