Demonstration protractor

Abstract

1. The name of the design product: teaching demonstration protractor. 2. The use of the design product: angle teaching demonstration and angle measurement. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view. 5. Other circumstances that need to be explained: the moving ruler of the design product can be rotated by 90° along the vertex, and the arc scale can be folded up and down, forming the unfolded state and the closed state of the product.

Images