1. Write the equation of circle with center at (-2,3) and radius 4
2. Write the equation of circle with center at (2,-1) and radius 7
3. Find radius and center of circle with equation (x+1)2 + y2=5
4. Find radius and center of circle with equation x2+(y-5)2=5
5. Find equation of circle with center at (0,3) which has point (0,6)
6. Find equation of circle with center at (3,-1) which has the origin.