...条相交的边,以及较小的几何图形(例如四边形内部形成三角形)。 简单四边形又分为凸四边形和凹四边形。凹面四边形有相邻的边,在图形内部形成反射角。在内部没有反射角的简单四边形是凸四边形。凸四边形总是可以有...
...(AO=OC,BO=OD) •每一条对角线将四边形划分为两个等余三角形。(∆ADB→∆BCD,∆ABC→∆ADC) 此外,边的平方和等于对角线的平方和。这有时被称为平行四边形定律,在物理和工程中有着广泛的应用。(AB2+BC2+CD2+DA2=AC2+BD2) 一...
...对角线彼此平分(AO=OC,BO=OD) •将对角线分成两个等边三角形。(∆ADB∠∆BCD,∆ABC∠∆ADC) 此外,边的平方和等于对角线的平方和。这有时被称为平行四边形定律,在物理和工程中有着广泛的应用。(AB2+BC2+CD2+DA2=AC2+BD2) 一...
...个几何图形的属性相同,那么这两个图形就相等。例如,三角形的面积可以等于正方形的面积。在这里,只考虑物业面积的大小,它们是相同的。但这些数字本身不能被认为是相同的。 一致的 在几何学中,同余意味着图形(...
...rmined by the angle of intersection of the plane and the axis of the cone. When the cone is cut at right angles to the axis, we get a circular shape. When cut at less than a right angle but more than the angle made by the side of the cone results in an ellipse. When cut parallel to the side of the c...
当你刚刚开始学习网络和IP地址是如何工作的时候,这一切看起来都有点让人不知所措,但是只要稍微学习一下,你就能理解这一切是如何结合在一起的。今天的超级用户问答帮助一个困惑的读者了解IP地址如何为他的Wi-Fi网络...
...equally distant from each other on the color wheel, forming the shape of a triangle — one example is yellow, red, and blue.Split-complementary: A split-complementary scheme mixes together a single color with its complementary color, and then the two colors on either side of it — yellow and blue-...
...向指向矢量的方向,线段的长度与矢量的大小成正比。 如何写向量 A vector can be written down in several ways. One method is to use bold characters e.g. . You can also use an underline ( ) or an arrow drawn on top of a letter ( ). If the symbol for a vector is written with...
...将学习两种不同的乘向量的方法,使用标量积和叉积。 如何用标量乘向量 当你将一个向量乘以一个标量时,向量的每个分量都会乘以这个标量。 Suppose we have a vector , that is to be multiplied by the scalar . Then, the product between the vector...
...ng this time is given by . This is shown by the grey arrows in the vector triangle drawn on top right. With the blue arrows, we have placed and in a different arrangement to get the same . The reason why I have drawn the second diagram the blue vectors is because this is how the vectors are a...