Please help! Geometry-equations of circles

Question

write the equation of a circle with a center at (2,5) containing the point (13,5)

Answer 1

Circle with center at (h,k) and radius r:

(x-h)² + (y-k)² = r²

 

h=2, k =5

radius is distance from (2,5) to (13,5)=11

 

Equation: (x-2)² + (y-5)² = 11²