Here is the review for Unit 12 and the test on circles.
Test Review

Make sure you can name all of the elements associated with a circle.
Radius          Secant          Chord
Diameter      Tangent         Inscribed Angle
Central Angle

Know the equations for both area and circumference for a circle
Area=Pi*r^2
Circumferenc=Pi*d

Know the volume equations for shapes with 2 bases
V=Ba*h
For either a cone or a pyramid
V=1/3(Ba*h)

THE TEST WILL BE ON FRIDAY.  TAKE TIME TO LOOK OVER THESE CONCEPTS ALONG WITH THE EXAMPLE PROBLEMS.