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1·A triangle is a plane figure with three sides.

三角形是有三个边的平面图形。

2·A septilateral shape is a plane figure with seven sides.

七边形是在一个平面上有七个边。

3·A line segment forming part of the perimeter of a plane figure.

形成一个平面图形的边界的线段。

4·The area of an irregular plane figure can readily be obtained with this method.

采用该方法可以很容易地求解不规则平面图形的面积。

5·This article is intended to provide new algorithms for the intersection processing of straight line and arc used in the 2-D plane figure.

本文介绍了一个用于二维平面图形的直线、圆弧相贯处理的新算法。

6·To analyse accelerations of points on plane figure generally the method of base point and the method of instantaneous acceleration center are used.

分析平面图形上点的加速度问题通常用基点法和瞬心法。

7·Generally, base point method is used when we analyze the acceleration of a paint in the plane figure, we seldom use the instantaneous center method.

分析平面图形上点的加速度问题一般采用基点法，很少采用瞬心法。

8·From commonly used equation of calculating plane figure quadrature, formulas of calculating plane figure quadrature by applying curve parametric equation can be deduced.

从由曲线普通方程求平面图形面积的公式出发推出在各种情形下由曲线参数方程求平面图形面积的公式。

9·The thesis mainly analyses the application of traditional sign by four elements, including plane figure, shape, color, material, and it analyses the application further by several examples.

包装设计是用来销售产品的视觉符号，本文从平面图形、造型、色彩、材料四个包装设计元素中来分析传统符号在包装中的运用，并通过实例进一步阐述。

10·The theorem of projection of acceleration has been presented in this paper. According to the theorem, projection relation of acceleration of arbitrary two points on the plane figure is built.

本文提出了“加速度投影定理”，根据这一定理，建立了平面图形上任意两点加速度的投影关系。