Flächeninhalt eines Dreiecks

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

Marcus Helber, 15.10.2006, Erstellt mit GeoGebra