Angle measurement

The protractor is very familiar to everyone. When we first went to school, our rulers, triangles, protractors, etc. are often carried around, because you have to use math problems, but now you have these tools in your home? We often encounter such a situation, I can't find it every time I want to measure with a protractor.

So the author made a simple gadget to solve the problem of measuring angles encountered in life. Now we can use a laptop, computer, tablet or smartphone to measure around us anytime, anywhere. Angle. Use as follows: Take the object that needs to measure the angle and compare the picture of the protractor in the figure. After determining the approximate range, you can input the corresponding angle in the input box to make fine adjustments.

The knowledge of the protractor is popularized by the way. The work of measuring the horizontal angle or the vertical angle. The horizontal angle is the angle formed by the vertical projection of the direction line from one point to two targets on the horizontal plane. The vertical angle is a point to The angle between the direction line of the target and a specific direction in the same vertical plane. Usually the horizontal direction or the zenith direction is the specific direction. The angle between the horizontal direction and the target is called the elevation angle. The zenith direction and target The angle between the directions is called the zenith distance. In addition, the military uses the dense position as the unit of the angle. The angle measurement mainly uses the theodolite. The theodolite is placed during the angle measurement, so that the instrument center and the station mark center are on the same vertical line. After leveling the instrument with the leveling device on the sighting unit, observe the horizontal or vertical angle.

see also ruler and ruler on mobile