【中学受験問題に挑戦】101　正方形の中の三角形（面積問題）

Give it a try! ☺️ This is a problem about the area of ​​the world inside a square. Please use it to check your answers. ✨🍀🌈😊 This time, I used a question from Osaka Seikou Gakuin Junior High School (where I also regularly study). [Request] If you have any questions, please post them in the comments. *Due to settings, some messages may not be displayed or may not be able to be replied to. We apologize for any inconvenience this may cause.