Hardcore knowledge on campus
The easiest way to widen the score gap in junior high school is the math test, and the difficulty in math in the second year of junior high school is in geometry. Which questions in junior high school math are the easiest to widen the gap?There's no doubt about it – geometric guides!
The geometry auxiliary line answering became a watershed moment for the children's grades!Many senior math teachers often say that they have the math of geometry. In order to learn geometry well, children must build a model of geometric auxiliary lines in their minds, learn to make auxiliary lines, and construct models. I learned to design auxiliary lines according to the model, and I was able to solve the questions in the junior high school math exam.
The truncation method is a method of adding auxiliary lines in junior high school math and geometry problems. So when should the truncation method be applied?When it comes to verifying that a line segment is equal to the sum of the other two line segments, the general method is to truncate the length and complement the short method: 1. Truncation: Intercept one section in the long line segment is equal to one of the other two, and then prove that the remaining part is equal to the other;2. Make up for the shortness: extend a ** segment, the extended part is equal to another ** segment, and then prove that the new line segment is equal to the long line segment.