Engineers use it for building, Artillery uses it to project where their shells are going to hit.
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Geometry is used mainly in construction.
A geometric compass is an instrument, or a tool, used in plane geometry to draw arcs and circles. Not to be confused with the geometric and military compass invented by Galileo.
The answer is in the word -- Geo means 'Earth', and 'metry' means 'measure'. Geometry means to measure the earth. Ancient Egyptians used a form of simple geometry. When buildings or crops needed to be plotted out, geometry was used.
Geometry is very important because you practically see it everyday. Everything is geometry. Humans are geometry. planets are geometry. If you don't really understand how much geometry is used and important, then you should try to see somebody for geometry answers.
In geometry, deductive rules can be used to prove conjectures.