Hello, a 4-d shape is a shape that nobody knows, i do though a four D shape is a four dimentional object which you can pick up. it is a tesseract.
(ffaarrtt)
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What is a shape of a histogram?
A skewed bell shape.
Did you mean the name for a 50 sided shape? If yes it is a pentacontagon. C.J
A shape with seven edges is a polygon, more precisely it is called a heptagon.
A tetrahedron; a shape made of four triangles.