四边形

If the acute angle of the parallelogram is x , find x .

该平 四边形的锐角是 x°，求 x。

If fractional equation into Interdisciplinary equations into algebraic geometry problem, the problem will be transformed into quadrilateral triangle problem.

如将分式方程化为整式方程，将代数问题化为几何问题，将四边形问题转化为三角形问题等。

Methods:To study the changes of contour stresses acted on the rectangle of body system based on the evolution from four-footed animals standing to two-footed human body standing.

脊柱的结构与运动是按平行四边形的轮廓应力达到平衡的。根据Wloff定律，颈曲和腰曲是人类站立后，在平行四边形数学定律作用下形成。

The other classification of Double Chain is made of a serious of loop parallelograms, i.e., in the assemblies each set of four neighbouring hinges form a parallelogram.

另一类Double Chain是由一系列的平行四边形组成的，即每一对角单元相互之间的四个剪式铰节点形成平行四边形。

For example, omitting 'right angle' feature brings parallelograms under rectangles. The after called "underexatension" in the study, student can't understand relationship between graphs. For example, students don't think rectangles are one of the parallelograms.

前者往往是学童忽略一项属性的结果，例如忽略直角的特性，就会把斜长的平行四边形归类为长方形，而后者则因学童无法理解图形间包含关系的结果，例如把长方形排除在平行四边形的概念范畴之外。

The torso is fitted by a quadrangle, and each limb is fitted by one or two quadrangles.

用一个四边形拟合躯干，用一个或者两个四边形拟合每个肢体。

Although this method works well, it gives rise to cracks in the subdivision, i.e. corners of some quadrilaterals may lie on sides of others.

尽管这种方法工作良好，但它在细分这步也有一些缺陷，就是，一些四边形的拐角可能位于另外一些四边形的边上。

This kind of subdivision, although not economical in terms of the number of quadrilaterals, is precisely what we want for obtaining the parameters, i.e. a uniform, geometry/curvature based distribution of quadrilaterals is more important to get good parameters than the minimum number.

这种再分方法尽管在四边形的数量方面不是很经济，但它可以使我们得到精确的参数，就是说对于要得到一个好的参数来说，一个统一、基与几何或曲率的四边形分配比最小数量更重要。

The Practice Evaluation of Quadrilateral Concept for Elementary School Students, a book designed by the researcher of this study, will be a tool in evaluating middle- and high-graders' concept and degree of cognition about quadrilaterals.

采用自编的「国小学生四边形几何概念实作评量」为研究工具，探讨国小中、高年级学生四边形几何概念的认知情形及层次，并藉由模糊取向的认知结构分析了解学生的概念结构。

Map into any quadrilateral (including convex/complex quadrilaterals).

Aaform是我已经转化为任何四边形（包括凸/复杂四边形矩形图发展技术）。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。