四边形

If the lengths of the sides of a cyclic quadrilateral are 9, 10, 10 and 21 respectively, find the area of the

一圆内接四边形的四边长为9，10，10和21，求该圆内接四边形的面积。

Whatever the case, the shape of the cross-section of the said sphenoid part is either of an isosceles spherical trapezium or of any spherical quadrilateral.

无论哪种情况，楔形体的横截面形状要么是有两条边相同的球形四边形，要么是任意球形四边形。

Vortex lattice method is presented for calculating the loading distributions on all blades of propeller and hub which a number of small hyperboloidal quadrilateral panels are discreted.

螺旋桨采用离散涡环法，将桨叶表面和桨毂表面离散为一系列双曲四边形，在四边形网格中布置集中涡环和线源分布，根据物面条件建立方程得到涡和源汇分布的强度。

The line that joins the midpoints of the nonparallel sides of a trapezoid.

四个边相等的平行四边形；不是直角的等边平行四边形。

Most GPGPU algorithms employ processing passes that render quadrilaterals spanning the entire rectangular range of a renderable texture.

大多数GPGPU算法都采用可绘制四边形的处理pass，该四边形覆盖了一个表现纹理的整个矩形范围。

These stars form a parallelogram – a four-sided figure with its opposite sides equally long and parallel to one another.

这些星星组成了一个平行四边形-对边等长且平行的四边形。

The quadrilateral by joining the midpoints of sides in a quadrilateral with tow diagonals perpendicular each over in order is a parallelogram.

顺次连接对角线互相垂直的四边形边的中点，所形成的四边形是矩形。

A parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal.

相邻的边长度不相等的平行四边形；只有相对的边长度相等的非直角平行四边形。

The researcher finds that with the analysis of the process of activities, the conduction of the games assist junior one students in clearing the misunderstanding of the different definitions, characteristics and qualities of quadrilaterals. Furthermore, it actively constructs and recognizes the notions of "parallelograms include squars, rectangles and rhombuses". In the end, the researcher proposes the adoptable organic solution to "rectangles include squars","rhombuses include squars" and "squars are the overlapping of rectangles and rhombuses" during the process of activities in the suggestion.

最后，经过研究者对活动历程的分析发现，透过此游戏的进行，协助了国一学生厘清对不同四边形定义、特徵与性质的迷思概念，并主动以非形式推论的方式建构且理解「正方形、长方形、菱形均包含於平行四边形中」，至於「正方形包含於长方形」、「正方形包含於菱形」与「长方形与菱形共同会包含到的图形是正方形」的概念，研究者在本文的反思与建议中，亦提出了活动历程中可采取的机制方法。

For best performance , use triangles and quads or a combination of both .

为了更好的性能，使用三边形和四边形或联合使用三边形与四边形。

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。