Q. Center point of circle (Solved)
1. [x1+x2]/2; [y1+y2]/2; [z1+z2]/2
2. [x1-x2]/2; [y1-y2]/2; [z1-z2]/2
3. [x1-x2]; [y1-y2]; [z1-z2]
4. [x2-x1]; [y2-y1]; [z2-z1]
- a. [x1+x2]/2; [y1+y2]/2; [z1+z2]/2
1. [x1+x2]/2; [y1+y2]/2; [z1+z2]/2
2. [x1-x2]/2; [y1-y2]/2; [z1-z2]/2
3. [x1-x2]; [y1-y2]; [z1-z2]
4. [x2-x1]; [y2-y1]; [z2-z1]