

3. 
How many common tangents can be drawn to the two circles?


4. 
_{}P and _{}Q have radii 9 and 11. Given the distance between the center of the circles P and Q is 10, find the length of the common chord _{}.


5. 
Amber is working on a sewing project. She has a circular piece of fabric, and needs to find the center. How can she do that? 


7. 
How can you illustrate the definition of a circle? 

8. 
Can any chord of a circle ever equal the radius? 


10. 
Explain the difference between a line segment containing the center of a circle with endpoints on the circle and a line segment that has one end point on the circle and another at its center. 
