Square, Star, Semi-Circle. Possibly a sphere?
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It depends on the 7 shapes that you start with.
Square and scalene triangle are shapes.
Lots of shapes. To start with, an irregular blob (that is a technical term)!
star sphere
In most shapes the diagonals do not bisect one another. It might be possible to answer the question if it were more specific. To start with, shapes with how many sides?