Name of teaching aid: "Simple compass"

2. Simple production:

1 design intent

When talking about ruler drawing, in order to make the drawing steps more standardized and the effect more accurate, it is easy for students to accept and understand; And can draw accurately.

2 design steps

First, take a piece of chalk (the color can be selected according to the situation), open it from the middle and take its upper part; Then prepare a slightly longer thin line, wrap it in the middle of the selected chalk, and drag it hard; Finally, the thread is tied tightly to make it a whole, and a "simple compass" is made.

Three. Features of teaching AIDS:

The design of the teaching aid is simple, feasible and practical, and the operation is convenient and feasible, which makes abstract mathematical knowledge intuitive. It can stimulate students' interest in learning and encourage them to learn new knowledge.

Four. The use of teaching AIDS:

Teaching aid with the nature of bisector.

I hope I can help you.