Octagon from rectangle

From tablecloth rectangular shape with dimensions of 4 dm and 8 dm we cuts down the corners in the shape of isosceles triangles. It thus formed an octagon with area 26 dm2. How many dm2 we cuts down?

Correct result:

x =  6 dm2


x=8 426=6 dm2x=8 \cdot \ 4-26=6 \ \text{dm}^2

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