These all algorithms are interactive. Some of them can be modified and re-run again by clicking upper right part of the code part. Visit Convex Hull and Smallest Enclosing Circle first. They are well documented algorithms for modifying.

Convex Hull

Well know Convex Hull problem is coded here. It is very basic algorithm in Computational Geometry.

Smallest Enclosing Disk

Problem of finding smallest circle that contains all of a given set of points in the Euclidean plane.