[103] 複素平面の幾何学 ガウス平面 相似条件と正三角形

Contents: Thanks for watching. This video is about how useful complex number system is for classical plane geometry. The addition of complex number is not really new concept because it’s just the same as 2-dimensional real vectors, but the crucial point is the multiplication which represents scaling and rotation at the same time in polar coefficient system. Not only is the phenomenon efficient, but it’s also beautiful. 動画の内容：複素数が如何に便利か動画です。複素数は加法に関していえば実2次元ベクトルと等価ですが、その面目躍如たるは乗法の幾何学的性質です。それを古典的な平面幾何に応用しようという試みですね。楽しいだけではなく美しいです。 -------------------------------------------------------------------------------- 主に数学に関することを動画にしています。みんなで面白いことをあーだこーだ言えたらいいなと。 動画に関するアドバイス（声量・ライト・ペン・板書など）や動画にしてほしいことなど何でも受け付けております。むしろください。 contact → maths.toshi@gmail.com Thanks a ton for visiting here and reading this. Please subscribe this channel and give this video a like if you like it. I usually make videos about mathematics, but any kinds of topics which I find interesting and attractive. All I want to do is just discuss and talk about them, and communicate with people who are into maths, after all. I am afraid to say that I basically speak in Japanese in my videos; however, I am going to try and write things down in the way everyone can comprehend what they are, not without mathematics literacy at least :-). I would appreciate if you gave me any kind of advice ranging from the topics you would like me to bring about to the volume, my handwriting, and the lighting in my videos. Please do not hesitate to leave any comments for this channel growth, and help me to enrich this channel.