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第六十一課 本課主題:複習,論證問题的解法本課計劃 I.課外作業檢查。II.複習提問。1.證明多角形内角和的定理。多角形内角和与其邊數有關係嗎?舉例,凸多角形外角和與其邊數有關係嗎?舉例,20角形內角和等於若干度?外角和呢?2.兩多角形的內角和各為10直角与4直角問各有幾邊?其外角和等於若干度?3.若多角形內角和為19直角,問邊數若干?多角形外角和連同一內
Lesson 61 Topics in this lesson: Reviewing, Demonstrating the Solution to the Problem Lesson Plan I. Extracurricular Homework Examination. II. Review Questions. 1. Prove the theorem of polygon angle sums. Is there any relationship between the internal angle of a polygon and the number of its sides? For example, does the external angle of a convex polygon have a relationship with the number of its sides? For example, the internal angle of a 20-corner angle equals several degrees, the external angle and it? 2. the internal angle of two polygons and each For 10 and 4 right angles, how many sides are there? The outer angle is equal to several degrees. 3. If the inner angles of polygons are 19, the number of questions is the same as the number of polygons and the inside of the polygon.