[204] 点と直線の距離 点と平面の距離 美しい証明 前編 ベクトルの内積の意味 法線ベクトル

Contents: Thanks for watching. I bet you have tried giving a proof of the distance between a given point and a line, and the impression is, the elementary way is just troublesome. Or rather, can you think of it right now? If not, I’m gonna tell you an elegant proof of it, making the most of inner product and normal vector. Enjoy. 初等的に証明しようとすると結構大変で、へこまされた経験のある人も多いのではないでしょうか？そこまでいかなくても今ぱっと証明できますか？ちょっと、、という方は是非ご覧ください。ベクトルと内積を用いたとても美しい証明をご紹介致します。 -------------------------------------------------------------------------------- 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.