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|Sections in parallelogram (Posted on 2019-05-05)
I place 2 points inside a parallelogram, and then draw a line segment from each point to each of the 4 vertices of this parallelogram, dividing it into 9 parts i.e 8 triangles and 1 quadrilateral.
If the four triangles with one side as the side of parallelogram have areas 13, 15, 18, and 19, respectively, what is the area of the central quadrilateral?
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