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'''Geometry''' (γεωμετρία; ''geo'' = earth, ''metria'' = measure) is a part of [[mathematics]] concerned with questions of size, shape, and relative position of figures and with properties of space. Geometry is one of the oldest sciences. Initially a body of practical knowledge concerning lengths, areas, and volumes, in the third century BC geometry was put into an axiomatic form by [[Euclid]], whose treatment set forth in his [Euclidean geometry]] became a standard for many centuries to follow. The field of [[astronomy]], especially mapping the positions of the stars and planets on the celestial sphere, served as an important source of geometric problems during the next one and a half millennia. A mathematician who works in the field of geometry is called a geometer.

'''Geometry''' (γεωμετρία; ''geo'' = earth, ''metria'' = measure) is a part of [[mathematics]] concerned with questions of size, shape, and relative position of figures and with properties of space. Geometry is one of the oldest sciences. Initially a body of practical knowledge concerning lengths, areas, and volumes, in the third century BC geometry was put into an axiomatic form by [[Euclid]], whose treatment set forth in his [Euclidean geometry]] became a standard for many centuries to follow. The field of [[astronomy]], especially mapping the positions of the stars and planets on the celestial sphere, served as an important source of geometric problems during the next one and a half millennia. A mathematician who works in the field of geometry is called a geometer.