"One, teaching material analysis.

1. Textbook content: The area of a polygon and the area of a parallelogram in Unit 5, Book 1, the standard experimental textbook of compulsory education curriculum of People's Education Press, lesson 65438 +0.

2. Textbook location: The area of parallelogram is the area of rectangle and square calculated by students on the basis of mastering the characteristics of parallelogram. Mastering the formula on the basis of understanding is helpful for students to learn the derivation method and prepare for the derivation of triangle and trapezoid area formulas. It plays a connecting role in the in-depth study of geometry knowledge.