This is a problem to find the area ratio of a plane figure.
Dividing a trapezoid by a diagonal line is a common type of problem. It is not unusual for only (3) to be asked in a difficult junior high school, so it may be a good question for children who are good at geometry.

☆ Problems introduced in the video ☆
La Salle Junior High School 2025 4⃣

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We are updating almost every day with the aim of delivering content that will help improve academic ability for junior high school entrance exams and interesting math that makes you think.

In math exams, one question is roughly equivalent to a standard deviation of 2 to 2.5. (Even when considering the population and point distribution) In this video, we will explain how to think about the problem and how to work during the exam with the aim of increasing the standard deviation by 5.

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[Kono Takaaki]
Graduated from Nada Junior High School and Nada High School. Teaching experience of over 30 years. Since his time at university, he has worked at a major cram school for many years, creating many textbooks for Nada Junior High School Open Tests, Public Academic Ability Tests, Pass/Fail Assessment Tests, Sunday Special Training for Preferred Schools, and the highest level of special training. He currently runs a private and small group special cram school in Kyoto called APEX, which specializes in private school entrance exams.

★APEX: Private School Entrance Exams★
In Shijo Karasuma, Shimogyo Ward, Kyoto City, he provides exam guidance for junior and senior high schools such as Nada, Rakunan, Rakusei, Todaiji, and Higashiyama, as well as private and small group guidance for junior and senior high school students.
Address: 301 De Reed Building, 289 Ogisakayacho, Shimogyo-ku, Kyoto
Telephone number: 075-343-8970 (reception hours: weekdays 14:00-22:00, Saturdays 10:00-21:00)
Email address: mail@kyoto-apex.jp
Website: www.kyoto-apex.jp/

#Junior high school entrance exams
#Nada Junior High School Math
#Math