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There are different geometries but in the most intuitive one, Euclidean Geometry, the undefined "objects" are point, line and plane while incidence, congruence and being between are undefined concepts.
mole
Probably angles and shapes.
Geometry has many uses..... For examples construction of pryamids uses geometry... or even in construction of bridges and other enjeenering marvels.....
point,line,and plane