Radical axis
So imagine you have two circles that are kinda like round cookies. They are both kinda different sizes and shapes, but they have some parts where they overlap.
Now, let's draw a line that goes straight through both of the circles, kinda like you are cutting both cookies in half at the same time. This line is called the "radical axis."
This line is special because if you take any point on the line and draw lines from that point to the edge of each circle, the distance from that point to the edge of one circle and the distance from that same point to the edge of the other circle will be exactly the same. So, basically, the point is the same distance away from both circles.
This is helpful because it means that any point on the radical axis is kinda like a balance point between the two circles, where they are equal distance from each other.
Now, let's draw a line that goes straight through both of the circles, kinda like you are cutting both cookies in half at the same time. This line is called the "radical axis."
This line is special because if you take any point on the line and draw lines from that point to the edge of each circle, the distance from that point to the edge of one circle and the distance from that same point to the edge of the other circle will be exactly the same. So, basically, the point is the same distance away from both circles.
This is helpful because it means that any point on the radical axis is kinda like a balance point between the two circles, where they are equal distance from each other.