01-PlanarSystem | 02-CustomRemove | 03-DeepCopy | 04-PropChecker | 05-YoungestPerson | 06-Grouping

// 01. Write functions for working with shapes in standard Planar coordinate system
Points are represented by coordinates P(X, Y)
Lines are represented by two points, marking their beginning and ending
L(P1(X1,Y1), P2(X2,Y2))
Calculate the distance between two points
Check if three segment lines can form a triangle