Grades 5–10
Geometry Models
Area models, similar triangles and rotations — the picture-first geometry models used in many Chinese math classes, leading into high school Geometry.
The General's Horse: A Famous Chinese Shortest-Path Puzzle
The Bird's Head Model: Find This Area in 10 Seconds
The Butterfly Model: Find the Wings in 10 Seconds
Three Equal Angles on a Line: Find This Side in 10 Seconds
The Swallowtail Model: Two Tails, One Simple Ratio
Do These 3 Angles Make 90°? No Protractor Needed
Which Triangle Is Biggest? Your Eyes Will Lie to You
Why Is This Triangle ALWAYS Half the Rectangle?
