ANALYTIC GEOMETRY PRESENTED BY GUO CHENG GUANG,LIM ZIJIE,GUO CHENGXI(01-04)

We used the Gaussian elimnation method for solving a pair of simultaneous linear equations reduces one equation to one that has only a single variable.

shoelace theorem also known as shoelace algorithm or Gauss's area formula or the surveyor's formula, is an algorithm, a nifty formula for finding the area of a polygon given the coordinates of its vertices, is equal to the absolute value of :Suppose the triangle has vertices (x1,y1),(x2,y2),(x3,y3), listed in clockwise order.

area of triangle =1/2|x1  x2  x3 x1|

                                     |y1  y2  y3 y1|

                            =1/2(x1*y2+x2*y3+x3*y1-x2*y1-x3*y1-x1*y3)

Lessons In Mathematics and Science (Physics, Chemistry and Biology) From Primary to University Presented By Guo Cheng Guang and Guo Chengxi In English. Your comment or suggestion is very much appreciated.

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