A very long time, it was used to design the Pyramids and Stonehenge
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At least a couple of thousand years.
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).
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.
in geometry, perimeter is the length around the outside of an object.
The geometry of Methane (CH4) is tetrahedron or tetrahedral