Kindly answer the attachment below, thank you

III. Solve the problem. 11. Find the equation of a circle which has the line segment joining (3, -4) to (-3,4) as diameter. 12. Find the equation of the circle whose center is at the origin and tangent to the line x + 3y = -10. 13. What is the area of the circle x2 + y? = 40 ? Leave your answers in terms of n. 14. Find the equation of circle whose center is at the point (2, -5) and is tangent to the x-axis. 15. Find the equation of circle whose center is at the point of (-3, 6) and is tangent to the y-axis