正 三角形

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正三角形的作图方法很简单，早在古代就已知了。

The construction for an equilateral triangle is simple and has been known since Antiquity.

这三艘航天器会围绕太阳运行，形成一个边长为五百万千米的正三角形。

The spacecraft will orbit the sun as an equilateral triangle with sides of5 million km.

用拟壳法建立了正三角形网格三向扁锥面单层网壳的轴对称非线性动力学基本方程。

By using the method simulated shells, the axisymmetrical non-linear dynamic equations of three-dimensional single-layer shallow conical lattice shells with equilateral triangle mesh are founded.

当三、六颗原子团在呈现正三角形的形貌时，会较其他种形貌稳定而难以改变其结构。

When trimer and hexamer show the equilateral triangle shapes, they will be more stable than other kinds of shapes.

测量了飞机数字，同意公式所使用的苍鹭，特别是那些为正三角形，正六边形的 （ 在这种情况下，不仅公式，但实际数字同意苍鹭的） 和部分的一个圆圈少于成半圆形...

gave measurements of plane figures which agree with the formulas used by Heron, notably those for the equilateral triangle, the regular hexagon (in this case not only the formula but the actual figures agree with Heron's) and the segment of a circle which is less than a semicircle...

此时，基体部2（正三角形）的截面二次力矩I由下式（1）表示。

At this time, the second moment of area I of the base member 2 (regular triangle) is expressed by Expression 1.

菱形；倒三角形；正三角形；向下箭头；向上箭头；星形；圆形

Diamond;Triangle Down;Triangle Up;Arrow Down;Arrow Up;Star;Circle

各交于一点，这三点是一个正三角形的定点（莫莱定理）

小苞片对生，正三角形，附在花梗的中间的部分上。

bracteoles opposite, deltoid, attached to median part of pedicel.

宿存花萼4-或5深深裂，裂片正三角形，具柔毛，具缘毛；

persistent calyx deeply 4- or 5-lobed, lobes deltoid, pilose, ciliate

通过正三角形分析色环及孟赛尔色立体水平剖面，寻找三角色设计的配色方法，并应用于家具设计中。

Color ring and a level section of A. H. Munsell color solid were analysed with regular triangle. Schemes for trigonal color design suitable for furniture design were suggested.

三， 交流单芯电力电缆，应布置在同侧支架上. 当按紧贴的正三角形排列时， 应该每隔1M用绑带扎牢.

AC 1-conductor power cables should be laid on the brackets at the same side. When the cables are arranged in equiangular triangle shape in close fitting, they should be firmly bundled with cable-ties at every 1M interval.

1、本图尺寸以厘米计，B为路基全宽，H为路基填土高度，L为复合地基处理深度，复合地基桩呈正三角形布置，间距为D，1.1m<=D<=2m，设计中根据具体情况确定。

All the dimensions in this drawing are in the unit of centimeter and "B" refers to the full width of the subgrade, H, the filling height of subgrade, and L, the treatment depth of composite foundation. Piles for composite foundation are arranged in equilateral triangle shape with spacing of D ranging from 1.1m to 2m. D will be determined according to the specific conditions during design.

一、"阻流管稳定装置"：采用正三角形分布，把防喷管和阻流管固定在一起，既可以使防喷管和阻流管同心，还可以分解天滑轮对阻流管产生的力矩；采用两排钢丝绳固定，施工期间不用吊车，避免了长期占用吊车和大风的影响，已经在风力超过7级的情况下无吊车施工了三次。

"Sealing grease recovery device": based on the principle of the oil-gas separator, fluids enter the device along the tangent direction for the first separation of grease from gas, and the top filter screen performs the second separation, thus affectively avoiding surface pollution during pressure relief.

图腾从而给予信众们寻求统一身份和凝聚力的物化代表：脖子上悬挂的大卫之星（犹太人的标记，两个正三角形叠成的六角形，译者注 ） ， 放在仪表盘上的象鼻神，扣在钱包上的圣克里斯托弗奖章。

The totem, then, gives believers a physical representation of that need for identity and unity: a Star of David hung from the neck; a Ganesh figurine placed on the dashboard; a St. Christopher medal tucked in the wallet.

叶片无毛或背面沿脉具短柔毛，基部楔形，边缘正三角形具牙齿，先端锐尖到短渐尖。

leaf blade glabrous or abaxially pubescent along veins, base cuneate, margin deltoid dentate, apex acute to short acuminate.

第二条线：以第一条线为基准，相邻两点之间成正三角形取点。

由於正三角形鑲嵌是由正三角形組成，又因正三角形內角為60度，因此每個頂點周圍都有6個三角形，且剛好占滿360度。

Because the internal angle of the equilateral triangle is 60 degrees, six triangles at a point occupy a full 360 degrees.