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In three dimensional object how do you know which is the length and which is the width?
3-D or you can say a prism.
One dimensional is a line between two points with a length. Two dimensional is a form like a circle or square with a length and width. Three dimensional is a form like a s…phere or cube with a length, width and height. Four dimensional is a form that changes with time. Five dimensional is a form that changes over time and space.
The base of a tetrahedron has 3 that are of equal length; essentially, it's made up of four equilateral triangles (hence the 'tetra'). A pyramid base has 4 sides of the same l…ength. in fact, There are actually an infinite number of such 'pyramid-like' objects, with different numbers of sides on the base.
Need a clear definition. Sounds like you are describing a 'cube' - almost.
To be 3 dimensional the sides must also have height.
Of two dimensional objects or surfaces, the length times the width/breadth gives the area.
What term as an acronym for three dimensional refers to an image that appears to have all three spatial dimensions of length width and depth?
a solid figure
Two examples of 2D figures are a square and rectangle drawn on a paper. Both example figures have length and width.
A two-dimensional object.
That depends on the objects under consideration of which none have been given but in general 2D objects have 3 or more sides as for example polygons.
The answer is in the question it is a 3D object such as a pyramid, a cone, a cylinder, a cuboid ... etc