[As expected, the Arithmetic Olympics]Graphic problems that can be easily solved by those who notice[Arithmetic for junior high school exams]

[Difficulty: ★★★ ☆☆]This is a problem of the 2012 Arithmetic Olympic Trial. ▼ Important solution points ① First, let’s check the prerequisites focusing on the angle. There is an auxiliary line that you should notice when comparing the triangle CDE figure and the triangle ADE. If you can spot this, the problem will be easy at once. ② If you see similar figures, the rest is easy. Since the length ratio is calculated, the length of CE can be calculated and the length of BE can be known. It was a problem that made me think sharply, which is very typical of the Arithmetic Olympics. It would be a simple problem if you could smoothly imagine similar figures from the confirmation of the prerequisites, but if you could not notice it, it would have been a very severe problem. Please solve it and enjoy the pleasure. ▼ Click here for each SNS of manavisquare HP https://manavigate.co.jp/ twitter https://twitter.com/manavisquare Yuta Sugato twitter https://twitter.com/mrkeiosfc16no1 ▼ Feel free to contact us please give me! kikaku@mnsq.jp