three dimention
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Dimension relates to measuring the size of an object. Common practice dictates that we measure objects by length and width [two dimensions]. The third dimension is normally the thicknessof an object.
A rectangle is a two dimensional figure having two dimensions aslength (L)bredth(B) But in the cased of three dimensional figure having three dimensions(one extra dimension as)height(H)So this figure having three dimension is called as Cuboid
A plane is the two-dimensional analogue of a point (zero dimensions), a line (one dimension) and three-dimensional space.
A two-dimension shape with eight sides is an octagon. A three-dimensional object with eight sides is an octahedron.