关于曲线参数方程的两个注记

Two notes for curvilinear parameter equation

在现行教材中,有关参数方程所示曲线的图像特点、描绘方法以及自身封闭所围成的平面图形的面积等都未给出明确的求法,为此,文中给出了关于曲线参数方程的两个教学注记,以弥补教材中的不足.

In present textbook, for curvilinear parameter equation , there is no defined methods to solve characteristic of graph, copy methods and the area of self-closed planar graph. So here we give two notes for curvilinear parameter equation to make up for the defect in present textbooks.