**Q11: **

The points , , , and form a rectangle. What is the equation of the circle that contains all four points?

- A
- B
- C
- D

**Q12: **

Determine the general equation of the shown circle passing through the origin point and the two points and .

- A
- B
- C
- D

**Q13: **

Find the general equation of the circle through the origin that also passes through and .

- A
- B
- C
- D

**Q14: **

Find the general form of the equation of a circle that touches the -axis and passes through the two points and .

- A ,
- B ,
- C ,
- D ,

**Q15: **

Find the center of the circle through points , , and .

- A
- B
- C
- D