About 1 1.2. The content of this lesson is taught on the basis that students understand straight lines and angles. Verticality is two straight lines on the same plane.

The special positional relationship between lines is widely used in life. When teaching, let students perceive the vertical phenomenon in life and get a preliminary understanding of the vertical line and the distance from point to line. And through a series of mathematical activities, students' spatial imagination ability has been further developed.