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A dimension is a 'measurable extent'.

A line is something which joins two points - it has length and no thickness - and so it considered to be one-dimensional.

A figure such as a circle, square or triangle is what is known as a 'plane' figure. These things have length and height on a page, but they have no depth - they are two-dimensional - This is usually written as 2-D. The use of the drawing technique known as 'perspective' allows us to make a 2-d drawing appear to have three dimensions.

A solid object, such as a ball, or a block of wood - has three dimensions - length, breadth and height. We humans are three-dimensional.

A drawing of a person is 2-D, the real person is 3-D

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16y ago

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