ANALYTIC GEOMETRY PRESENTED BY GUO CHENG GUANG,LIM ZI JIE,GUO CHENGXI(01...

area of polygen =1/2|x1  x2  x3 x4...xn x1|

                    |y1  y2  y3 y4...xn y1|

=1/2(x1*y2+x2*y3+x3*y4+...+xn*y1-x2*y1-x3*y2-x4*y3-...-xn*y4)

ANALYTIC GEOMETRY PRESENTED BY GUO CHENG GUANG,LIM ZI JIE,GUO CHENGXI(01-05,S/N: 5) Presented By Guo Cheng Guang (aged 11), LIM ZI JIE(aged 11) and Guo Chengxi (aged 8) in English. 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. https://www.youtube.com/channel/UC2dG5T9SJkUFTy-h0KbVbkw