Circle and Point constructors

The Geometry practica start with numeric centerX and centerY on Circle (chapters 1–2) and later store a Point as the centre (chapter 3). The teaching note compares those designs: constructor parameters versus stored attributes, and UML association versus composition.

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It belongs with:

• 1.4 Constructors and 1.6 Class diagram - design 1 (centre as numbers)
• 2.4 Constructor chaining and 2.6 Class diagram - still design 1
• 3.2 Classes as attribute, 3.3 Class diagram and 3.4 Relationship between Circle and Point - design 2 (centre as a Point)