Answer:
<CYZ = 60 degrees 
Explanation:
CY = CZ ==> both segments are radiuses of the circle since they both have
 a CenterPoint at Point C and a point touching the edge of the 
 circle
CY = YZ ==> Since CY=CZ and YZ=CZ, CY also equal YZ. In addition, this
 means that CY, YZ, and CZ are all radiuses of the circle
Hence, CY = YZ = CZ.
Since all sides of the triangle are equal, that means that all angles of the triangle are equal as well:
<CYZ + <CZY + <YCZ = 180 ==> 180 is the total degrees in a triangle
<CYZ + <CYZ + <CYZ = 180 ==> all angles have the same measure
3 * <CYZ = 180 ==> solve for <CYZ
(3 * <CYZ)/3 = 180/3 ==> divide by 3 on both sides to isolate <CYZ
<CYZ = 60 degrees