Dreieck/Drei Punkte/Flächeninhalt/Aufgabe

Es seien

{}P_{1}=(a_{1},b_{1}),\,P_{2}=(a_{2},b_{2})

und

{}P_{3}=(a_{3},b_{3})

drei Punkte im

{}\mathbb {R} ^{2}

. Stelle den Flächeninhalt des zugehörigen Dreiecks mit

{}a_{1},b_{1},a_{2},b_{2},a_{3},b_{3}

dar.

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