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There can be no closed 3D shape with only one square and 3 triangles.
A square is a parallelogram a parallelogram isn't always a square. The definition of parallelogram is a closed shape with two parallel sides. So a rectangle is a parallelogram and so is a square and a rombus. The definition of square is shape with four equal sides.
A polygon is a shape that is a closed figure and has straight lines. example. A square
make a square with a triangle at the end and combine into one big shape
It is an area equivalent to 25.9 square kilometres, approx. The area could be in the form of any 2-dimensional closed shape.