First of all, protractor
1. structure: protractor usually consists of a transparent semi-circular plate and a fixed scale line. The scale marks on the semi-circular plate are used to measure angles, usually in degrees. The center point of the semi-circular plate is the vertex of the angle, and the scale line extends from the vertex to read and draw the angle.
2, how to use: using a protractor is very simple. First, put the vertex of the protractor on the vertex of the corner, and then adjust the protractor so that the scale line is aligned with one side of the corner. Finally, the angle can be obtained by reading the corresponding angle value on the scale line from the protractor.
3. Application field: protractor is widely used in many fields. For example, in drawing and design, protractor can be used to draw line segments and curves with different angles; In architecture and engineering, protractor can be used to measure the angle of buildings and structures; In mathematics and physics, protractor is an important tool to study angles and geometric shapes.
4. Angle unit: The protractor usually measures the angle in degrees (degrees), with a total circumference of 360 degrees. In addition, protractor can also be used to measure other angular units, such as radian and scale.
Second, Global Plaza.
Universal square is a multifunctional tool that can measure and draw angles. It usually consists of two telescopic arms and an adjustable dial. When using the universal square, you can measure and draw various angles by adjusting the position of the arm and the angle of the dial. Universal square is suitable for engineering and architectural design that needs to measure different angles.
Third, the rotation angle measuring instrument
The rotation angle measuring instrument is a precise measuring tool, which is often used in engineering and scientific research. It uses laser or photoelectric sensor to measure the rotation angle of an object, which has high accuracy and sensitivity. The invention is suitable for experiments and research fields that need accurate angle measurement.
Fourthly, digital goniometer.
Digital goniometer is an electronic measuring tool, which can measure and display the angle value in real time. It is usually composed of sensor, display screen and electronic controller, and has the characteristics of high precision and convenient use. Digital goniometer is suitable for engineering, manufacturing and scientific research fields that need to measure angles quickly and accurately.