The Greeks started it
This is a difficult question to answer since geometry has been around in one form or another as long as there has been written history. The Egyptians were making use of geometry to build pyramids even in prehistoric times. It was the Greeks, however who first began to rigorously study geometry and try to prove facts about it. Euclid was perhaps the most notable geometer of ancient mathematics and it was he who first axiomatized the subject (carefully defined the concepts crucial to geometry).
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Elliptical geometry is like Euclidean geometry except that the "fifth postulate" is denied. Elliptical geometry postulates that no two lines are parallel.One example: define a point as any line through the origin. Define a line as any plane through the origin. In this system, the first four postulates of Euclidean geometry hold; through two points, there is exactly one line that contains them (i.e.: given two lines through the origin, there is one plane that contains them) and so on. However, it is nottrue that given a line and a point not on the line that there is a parallel line through the point (that is, given a plane through the origin, and a line through the origin, not on the plane, there is no other plane through the origin that is parallel to the given plane).
This is a difficult question to answer since geometry has been around in one form or another as long as there has been written history. The Egyptians were making use of geometry to build pyramids even in prehistoric times. It was the Greeks, however who first began to rigorously study geometry and try to prove facts about it. Euclid was perhaps the most notable geometer of ancient mathematics and it was he who first axiomatized the subject (carefully defined the concepts crucial to geometry). that's all I have read about.
probably just the analogy between geometry and arithmetic. Merely a 1:1 correspondence, not a logical link.
take a protractor and line up the origin of the angle with the dot. then folow th line up to the corresponding numbe, which is the angle
It was the French mathematician Rene Descartes who introduced coordinated geometry by means of the Cartesian plane which consist of an horizontal x axis and vertical y axis that are perpendicular to each other and bisect each other at the origin whose coodinates are (0, 0)