M2 Determinants q1

2013-01-21 12:11 pm
好心人Pls. help help幫幫忙牙?因為在下只是小學級(可憐不能用HTML功能), 麻煩請看連結Tks.


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回答 (1)

2013-01-21 6:52 pm
✔ 最佳答案
since the area of triangle ABD

  |1|x1 y1 1||
= |-|x2 y2 1||
  |2|x3 y3 1||

the area of parallelogram ABCD

    |1|x1 y1 1||   ||x1 y1 1||
= 2x|-|x2 y2 1|| = ||x2 y2 1||
    |2|x3 y3 1||   ||x3 y3 1||


參考: knowledge


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