Internal representation of geometric objects

Nigel Vinckier shared this question 5 years ago

I was wondering how geometric objects are represented in Geogebra. It

cannot be "purely" numerically, because when for instance I ask for the

relation between the two segments of a triangle inscribed in a

semicircle (diameter as its base), I get that it will always be true

that they are perpendicular. How does Geogebra "proof" this purely

geometrical property (which would, I suspect, not be exact or stable

under rounding error)? Do feel free to redirect me to other topics or

the manual. Thanks!

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