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教学要求:1.使学生理解和掌握与圆有关的概念和一些重要性质;掌握直线与圆、圆与圆的位置关系,特别是直线与圆、圆与圆相切的判定与性质.能运用这些知识进行论证、计算和作图.2.使学生理解正多边形的概念,掌握等分圆周作正多边形的方法,能正确地利用圆内接正多边形的性质、圆的周长、面积的计算公式,解决一些有关的计算问题.3.理解反证法证明命题的思路,能够运用反证法证明一些比较简单的几何命题.
Teaching requirements: 1. To enable students to understand and grasp the concept and some important properties related to the circle; to grasp the positional relationship between the straight line and circle, circle and circle, especially the judgment and nature of the tangency between the line and circle, circle and circle. This knowledge is used to demonstrate, calculate, and graph. 2. To enable students to understand the concept of regular polygons, and to grasp the method of equally dividing the circumference into regular polygons. It can correctly use the properties of a circle inscribed regular polygon, and the calculation of the perimeter and area of a circle. Formulas to solve some of the computational problems. 3. Understand the idea of proving the propositions of anti-evidence methods, and use contradictions to prove some relatively simple geometric propositions.