Area of Quadrilateral inside a rectangle

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SUMMARY

The discussion focuses on calculating the area of quadrilateral CDGE within a rectangle by dividing it into triangles. The area ratios of triangles ABE and ECD are established as 4:1, while the ratios of triangles ADG and DGE depend on segments AG and GE. Additionally, the relationship between triangles ADG and AGF is defined by the segments DG and GF. The suggestion to extend lines AE and DC to find their intersection point H is highlighted as a crucial step in solving the problem.

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Homework Statement
Please see the picture below.

If AF = FB, BE = 4CE and the area of AGD = 100, find the area of CDGE
Relevant Equations
Not sure
1673404002767.png


I try to divide the area of CDGE into two areas of triangles by drawing line DE.

The ratio of area of triangles ABE and ECD = 4 : 1

The ratio of area of triangles ADG and DGE = AG : GE

The ratio of triangles ADG and AGF = DG : GF

Then I don't know what to do.
 
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Why don't you extend AE and DC and observe they cross ,say, at H ?
 
Last edited:
anuttarasammyak said:
Why don't you extend AE and DC and observe they cross ,say, at H ?
I understand your hint. Thank you very much anuttarasammyak
 

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