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NOT POSSIBLE

It is not possible to put 20 isosceles triangles into the form of a square. It takes 2 isosceles triangles to make one square. 6 more isosceles triangles would have to be added before a larger square could be made.

For an isosceles triangle with leg length x, the number of triangles needed to make a square is modeled by the equation

N = 2 * x2

where N is the number of triangles and x is the number of isosceles triangles touching any side of the square.

There is no integer solution for x when N = 20, meaning it is not possible to arrange 20 isosceles triangles in the shape of a square.

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