A half the radius, or 1/2r
B the circumference, or 2πr
C half the circumference, or πr
D the Radius, r
![A half the radius or 12r B the circumference or 2πr C half the circumference or πr D the Radius r class=](https://us-static.z-dn.net/files/dae/6e4ae80e8bef0e96e8a21c85495435c9.png)