Flächeninhalt des Dreiecks

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Welche Formel liefert den Flächeninhalt AABC?
1. AABC = 2 · (c + hc)
2. AABC = c · hc
3. AABC = 2 · c · hc
4. AABC = 0,5 · c · hc
5. AABC = 0,5 · (c + hc)
 

Marcus Helber, 30.9.2006, Erstellt mit GeoGebra