【中学受験算数】平面図形　斜線部分の面積　どう解く？【最難関クラス/偏差値up】

This is a problem about finding the area of ​​a triangle. First, we'll do some tedious calculations using the similarity of right-angled triangles. The numbers that come up are complicated, but the answer is actually quite simple. Now, since we know the area of ​​the shaded area, we should also be able to find the height with a base of 9cm. How can we do this? Subscribe to our channel, like, and leave a comment! It will really encourage us! We aim to provide content that will help students improve their academic performance for junior high school entrance exams and provide engaging math lessons. On math exams, one question is roughly equivalent to a standard deviation score of 2 to 2.5 (even taking into account the population and point distribution). In this video, we'll explain how to approach the problem and what to do during the exam, aiming to improve your score by 5 points. ◆Subscribe to our channel here↓    / prestigiousprivateschooladmissionsguidance...   [Takaaki Kono] Graduated from Nada Junior High School and Nada High School. Over 30 years of teaching experience. Since his university days, he has worked at a major prep school, where he has been involved in creating numerous textbooks for the Nada Junior High School Open Test, public academic ability tests, pass/fail assessment tests, Sunday intensive training for specific schools of choice, and top-level intensive training. He currently runs a private, small-group tutoring school in Kyoto called "APEX: Preparing for ... Address: 301 De Reed Building, 289 Ogisakaya-cho, Shimogyo-ku, Kyoto Phone Number: 075-343-8970 (Weekdays 2:00 PM - 10:00 PM, Saturdays 10:00 AM - 9:00 PM) Email Address: [email protected] Website: https://www.kyoto-apex.jp/ 〚 Other people's videos introducing arithmetic and math problems〛 [Junior High School Entrance Exam Math] Shocking Ideas!!! Interesting Geometry Problems Even Adults Can't Solve    • 【中学入試算数】衝撃的な発想！！！大人でも解けない面白い図形問題   [Seiryo High School Entrance Exam Questions] Must-Try Geometry Problems: Guaranteed Easy-to-Understand Explanation Lesson (For 3rd Year Junior High School Students, High School Students, and Up *Also open to elementary school students planning to take the junior high school entrance exam)    • Video   A devilishly difficult problem too difficult for elementary school students! ? You can't solve it without basic knowledge! [Junior High School Entrance Exam Math] [Entrance Exam Questions]    • 小学生には難しすぎた鬼難問！？基本が無いと絶対解けない！【中学受験算数】【入試問題】   [Interesting Math Problems] How to Solve Them? Kaichi Junior High School Entrance Exam Math Plane Geometry    • 【面白い算数問題】どう解く？ 開智中 中学受験 算数 平面図形   [Puzzle-like Thinking] Geometry Problems That Skilled People Can Solve in Seconds [Junior High School Entrance Exam Math]    • 【パズル的思考】できる人は数秒で解けてしまう図形問題【中学受験の算数】   Many People Solve Them Using the Pythagorean Theorem, Kaisei (Nagasaki)    • 三平方の定理を使って解く人が多いけど　海星（長崎）   [Can You Solve It?] Surprisingly Difficult Geometry Problems from Nada High School    • 【解ける？】灘高校の意外と解けない図形問題   #JuniorHighSchoolEntranceExam #Math #PlaneGeometry