1, take a wooden board (not too thick) or use cardboard instead.

2. Make a circle and divide it into 15 equal parts along the radius.

3. Take one of them and divide it into two parts equally along the radius of the circle.

So far, there are 14 whole copies and 2 half copies.

4. Take two pieces of cloth, stick seven whole pieces into one piece along the periphery of the circle, and then stick 1 half piece.

5. Repeat the above operation for another piece of cloth.

6. Cut the remaining strips of cloth.

In this way, a complete circular area teaching aid is completed.