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  <author_name>Hyperion64</author_name>
  <author_url>https://blog.hatena.ne.jp/Hyperion64/</author_url>
  <blog_title>完全無欠で荒唐無稽な夢</blog_title>
  <blog_url>https://hyperion64.hatenadiary.org/</blog_url>
  <categories>
  </categories>
  <description>４点の複素数がz[1],z[2],z[3],z[4]としよう。 その面積は下記となるはず。1/2 Im[-Conjugate[z[3]] z[2] + Conjugate[z[2]] (-z[1] + z[2]) + Conjugate[z[3]] z[3] - Conjugate[z[4]] z[3] + Conjugate[z[1]] (z[1] - z[4]) + Conjugate[z[4]] z[4]] Im は虚部を Conjugateは複素共役を意味します。</description>
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  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2013-06-23 00:00:01</published>
  <title>複素数平面の４角形の面積</title>
  <type>rich</type>
  <url>https://hyperion64.hatenadiary.org/entry/20130623/p1</url>
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