a four dimensional shape cannot exit within our own reality because we live and occupy space in 3 dimensions and no one can change that however we can view 4 dimensional objects in a 3 dimensional world however the object itself is not occupying space in four dimensions but emulating the way it could look in a 3-d world, a 4-d shape is one in which it would exist on 2 separate planes but only occupys one e.g the top of your stairs is also the bottom but when you get there your at the top even though you just walked down.
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A polygon; specifically a tetragon. A two-dimensional shape with four equal sides and four right angles is a square. A two-dimensional shape with two sets of equal sides and four right angles is a rectangle. A two-dimensional shape with two sets of equal sides and two sets of equal angles is a parallelogram. A parallelogram where each opposite angel bisects the shape is a rhombus. A two-dimensional shape with one set of equal, parallel sides and two sets of equal angles is a trapezoid. A three-dimensional shape with four triangular faces is a tetrahedron.
A two-dimensional shape with one curved side and four straight sides can be created, but there is not specific name for such a shape.
Squares and rectangles have a two-dimensional shape with four sides and four right angles.
A sphere is indeed a three dimensional shape. It is a circle rotated about an axis several times to create and three dimmensional object from a two dimensional shape.
A rectangle is a two-dimensional shape, so it doesn't have faces in the way that three dimensional shapes have. A rectangle has four edges and four corners.