数学概念是学好定理、公式、法则和数学方法以及提高解题能力的基础。以下列举几对容易混淆的几何概念,加以辨析,供同学们参考。一、直线、平角当角的终边和始边成一直线时,这个角叫平角。所以可以认为平角是一条直线。但却不能因此把直线与平角这两个概念混 Mathematical concepts are the basis for learning the theorems, formulas, rules, and mathematics methods, as well as improving the ability to solve problems. The following lists several pairs of confusing geometric concepts, to identify them for reference. First, straight line, straight angle When the end of the angle and the beginning of the line in a straight line, this angle is called a flat angle. So you can think of a flat angle as a straight line. However, we cannot mix the two concepts of straight line and flat angle