Circles and rectangles are plane (2-dimensional) figures, so
it doesn't seem that they can be used to construct solids.
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Every square is a rectangle, but not every rectangle is a square.
A Venn diagram gets unwieldy with a large number of observations.It is impossible (in 2-d) to have more than three categories (circles).
To make a rectangle using a 6-piece tangram, you need to arrange the pieces in a specific way. First, place two large triangles together to form a square. Then, position the two small triangles on top of the square to create a larger square. Finally, fit the two parallelograms on the sides to complete the rectangle shape. This arrangement utilizes all six pieces of the tangram to form a rectangle.
By using Cartesian equations for circles on the Cartesian plane
Hold the SHIFT key down when inserting the shape.