コンパス作図教室｜中学数学の作図練習

This is a learning tool for middle school math, allowing you to practice geometric constructions by manipulating a virtual compass and ruler.

You determine the needle position and radius to draw arcs, select intersection points, and connect them with straight lines. You can try four different exercises, including perpendicular bisectors and angle bisectors, and check the steps with hints and examples. It also supports free drawing, undo, and redo.

This tool is useful when you want to understand geometric properties not only from the finished diagram but also from the construction process. Intermediate drawings and learning records are saved on your device.