As shown in the figure, △ abczh, ad: DB = 1:2, de parallel to BC, if s △ ABC = 9, what is the area of quadrilateral dbec

AD :DB=1:2 AD:AB=1:3
S△ADE：S△ABC=1:9
So s △ ade = 1
The area of quadrilateral dbec is 9-1 = 8

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