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# Introduction to Three Dimensional Geometry

Any idea what does Geometry mean? This word is actually derived from the Greek word ‘geometron’. Here, ‘geometron’ is actually made of two words – Geo and Metron. So geometry is the mathematical study of all shapes and figures. In this following chapter let us study in detail about three dimensional geometry.

FAQ on Introduction to Three Dimensional Geometry

Question 1: What is meant by 3 dimensional?

Answer: In geometry, we can define a three-dimensional shape as a solid figure or an object or shape having three dimensions. They are length, width and height. Always remember that unlike two-dimensional shapes, three-dimensional shapes consist of thickness or depth.

Question 2: Who invented 3d geometry?

Answer: Euclid of Alexandria, who is said to be a student at the Academy by Plato was the one who wrote a treatise in 13 books (chapters). He named it ‘The Elements of Geometry’, in which he presented geometry in an ideal axiomatic form that we now know as Euclidean geometry.

Question 3: What are the first 3 dimensions?

Answer: By convention, the first three dimensions are said to be space dimensions x-y-z. Consequently, they are width, height, and depth. The first few dimensions are quite simple to understand, looking at the Zero-Dimension, we see there is only one point, no length, height or depth.

Question 4: What is a 3-dimensional coordinate system?

Answer: A three-dimensional Cartesian coordinate system forms by a point which we call the origin that denotes by O and a basis that consists of 3 mutually perpendicular vectors. We determine the coordinates of any point in space by three real numbers: x, y, and z.

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