The diagonals number of a regular polygon

Author:
PopiArdv
The diagonals number of a regular polygon
GeoGebra Applet
Μπορείς να βρεις τον αριθμό των διαγωνίων κανονικού πολυγώνου με ν πλευρές; Could you find the diagonals number of a regular polygon?

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