October 2012, Malala Yousafzai has been shot by Taliban who against her campaign for children' rights of education. Here is subtitle of her full speech of her 16 years old birthday. English and Japanese. Please use a HTML5 and Javascript supported browser (Firefox, Chrome, IE10, ...) to watch the video. If you have a problem to watch the video, this page is another page to watch the video.
Here is my question. The area of parallelogram is the difference of these two rectangles (red rectangle - blue rectangle). This is not intuitive for me. If you also think it is not so intuitive, you might interested in my slides. I try to explain this for hight school students. Slides: A bit intuitive (for me) explanation of area of parallelogram (to my site, external link) .
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