how do we use circle equations to solve problems?

How Do We Use Circle Equations to Solve Problems?

What is the midpoint?

(5,2) and (-3,-4)                          -4+2=-2

5+-3=2                                         -2/2=-1

2/2=1                                           -1=y

1=x

m=(1,-1)

What is the distance from (1,-1) to (5,2)?

d= (5-1)^2+ (2+1)^2

d= 16+9

d= 25

d=5