In addition to textbooks, some mainland Chinese, mathematics, English, politics and physics also have exercise books and unit papers. History, geography and chemistry are not only textbooks, but also picture books and atlases. In addition to biology textbooks, more than 20 copies should be distributed.
Through experiments, textbooks can help students understand the stability of triangles. On the basis of knowing that the inner angle of triangle is equal to 180, the properties of the outer angle of triangle are obtained by theoretical proof. Then, by introducing the related concepts of triangle and polygon. Using the related properties of triangle to study the inner angle, outer angle and formula of polygon.
Extended data:
Basic skills that students should master
(1) can be demonstrated and calculated with some concepts and properties about intersecting lines, parallel lines, triangles, quadrilaterals, similar shapes and circles.
(2) Be able to use tools such as straightedge, compass, graduated scale, triangle and protractor to draw graphs, and use straightedge and compass as common basic graphs to solve the simplest geometric drawing problem.
Thinking ability mainly refers to: observation, experiment, comparison, guess, analysis, synthesis, abstraction and generalization; Able to use induction, deduction and analogy for reasoning; Will logically and accurately explain their own ideas and opinions; Will use mathematical concepts, principles, ideas and methods to distinguish mathematical relations. Form good ideological quality and improve thinking level.
Baidu Encyclopedia-Middle School Mathematics (Subject)