The following formula gives the distance between two points (x1 , y1
) and (x2
, y2
) in the

Cartesian plane: √(x2−x1
)
2
+( y2−y1
)
2
.

Given the center and a point in a circle, you can use this formula to find the radius of the circle.
Write a program that prompts the user to enter the center and a point on the circle. The
program should then output the circle’s radius, diameter, circumference and area.