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Παραπληρωματικές γωνίες
Μετακινήστε τα σημεία Α, Β, C, D ή Ε για να μεταβάλλετε τις θέσεις των γωνιών ή τα μέτρα τους.
Δύο γωνίες ονομάζονται παραπληρωματικές όταν έχουν άθροισμα 180°