can somebody please make an equation for a vertical line going through the center on the wquation below

1 is c

2 is a

3 is a

step-by-step explanation:

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.

the answer to this is a. a^2 + b^2 = c^2

i'm pretty sure the answer is a. decreases with increase in