Online Geometry Problems, High School, College

Online Geometry Problem 446: Quadrilateral Area, Dividing the sides into 5 equal parts

The figure shows a quadrilateral ABCD of area S and lines that divide each of the sides in five equal parts. If S1 is the area of the quadrilateral EFGH, prove that Formula to prove.
 

Quadrilateral area, five equal parts sides

 

 

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