三角函数 - 维基百科，自由的百科全书
2025年1月7日 · 三角函數將直角三角形的内角和它的两邊的比值相关联，亦可以用单位圆的各种有关线段的长的等价來定义。 三角函数在研究 三角形 和 圆形 等 几何形状 的性质时有著重要的作用，亦是研究振动、波、天体运动和各种 周期性现象 的基础数学工具 [ 1 ] 。
Pi - Wikipedia
2 天之前 · The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.. The number π is an …
偏振 - 维基百科，自由的百科全书
5 天之前 · Wikipedia®和维基百科标志是维基媒体基金会的注册商标；维基™是维基媒体基金会的商标。 维基媒体基金会是按美国国內稅收法501(c)(3)登记的非营利慈善机构。 隐私政策; 关于维基百科; 免责声明; 行为准则; 开发者; 统计; Cookie声明; 手机版视图
Trigonometric functions - Wikipedia
3 天之前 · The trigonometric functions most widely used in modern mathematics are the sine, the cosine, and the tangent functions. Their reciprocals are respectively the cosecant, the secant, and the cotangent functions, which are less used. Each of these six trigonometric functions has a corresponding inverse function, and an analog among the hyperbolic functions.
Incircle and excircles - Wikipedia
4 天之前 · In geometry, the incircle or inscribed circle of a triangle is the largest circle that can be contained in the triangle; it touches (is tangent to) the three sides. The center of the incircle is a triangle center called the triangle's incenter. [1]An excircle or escribed circle [2] of the triangle is a circle lying outside the triangle, tangent to one of its sides and tangent to the extensions ...
偏振 - 维基百科，自由的百科全书 - zh.wikipedia.org
2025年1月8日 · 这实验设置简单地组成偏光仪（polariscope），又称“偏振光镜”；光束最先入射的偏振片为起偏器，然后再入射的偏振片为检偏器；水平偏振片与垂直偏振片共同组成“平面偏光仪”；左旋圆偏振片与右旋圆偏振片共同组成“圆偏光仪”。
Ellipse - Wikipedia
2 天之前 · An ellipse (red) obtained as the intersection of a cone with an inclined plane. Ellipse: notations Ellipses: examples with increasing eccentricity. In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant.It generalizes a circle, which is the special type of …
Permutation - Wikipedia
6 天之前 · According to the first meaning of permutation, each of the six rows is a different permutation of three distinct balls. In mathematics, a permutation of a set can mean one of two different things: . an arrangement of its members in a sequence or linear order, or; the act or process of changing the linear order of an ordered set.
偏振 - 维基百科，自由的百科全书 - zh.wikipedia.org
2025年1月8日 · Wikipedia®和维基百科标志是维基媒体基金会的注册商标；维基™是维基媒体基金会的商标。 维基媒体基金会是按美国国內稅收法501(c)(3)登记的非营利慈善机构。 隐私政策; 关于维基百科; 免责声明; 行为准则; 开发者; 统计; Cookie声明; 手机版视图
Mohr's circle - Wikipedia
2025年1月7日 · Figure 1. Mohr's circles for a three-dimensional state of stress. Mohr's circle is a two-dimensional graphical representation of the transformation law for the Cauchy stress tensor.. Mohr's circle is often used in calculations relating to mechanical engineering for materials' strength, geotechnical engineering for strength of soils, and structural engineering for strength …
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