Thank you for viewing! 〈Instant purchase is okay, but please read the profile as well〉 Feel free to ask any questions! Arithmetic Brain & Geometry Sense Edition: Stretch Your Hands Amazing! Triangle Ruler Included Triangle Puzzle List price: 1300 yen + tax Unused item stored at home. The included triangle ruler is also unused. There is a slight crease on the top 1 cm of the cover. Please check the image. I think it's in pretty good condition. Although it is an unused item, it has been stored at home. For those who understand, please. ↓ Product Description Below ↓ The first ever! Geometry textbook for lower grades focusing on triangle rulers Mr. Masanobu Takahama, the supervisor, in his book "Arithmetic Brain You Want to Cultivate by the 3rd Grade," lists "the ability to see" and "the ability to fill" as the learning abilities that children should acquire by the age of 10. This book is a learning material to cultivate that "ability to see." The ability to see, simply put, is the ability to "draw necessary auxiliary lines" and "imagine accurate figures." These abilities are said to be built on a foundation through outdoor experiences such as climbing trees and playing in rivers, and educational play such as building blocks and origami. The point is that they all involve using one's own body and senses, and thinking and completing them to the end. Triangle ruler sheet included! In elementary school, children each get a right-angled triangle and a right-angled isosceles triangle ruler. However, there are limitations to the figures that can be created with just those two. Then, they cannot fully understand the characteristics of triangles. Therefore, we have prepared 16 triangle rulers in total, 8 of each size, as an appendix. Using these original triangle rulers, they will desperately move their hands, and rack their brains, saying "this way or that way," to create various figures. The aim of this book is to build the foundation of the "ability to see"! The author says that if you thoroughly utilize triangle rulers by the lower grades, you will not get stuck on geometry problems even in the upper grades. ▲ From the Supervisor / Triangle rulers will dramatically improve your sense of geometry with 2 sheets each! ☆ Part 1: Amazing! You'll get a sense of angles with triangle rulers ☆ Part 2: You can draw auxiliary lines with triangle rulers ☆ Part 3: Triangle rulers will appear and you can see them ☆ Part 4: Let's use triangle rulers