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Geometry.
The coordinate plane allows the study of geometry using analytical techniques developed in algebra.
The study of shapes in three-dimensional space.
Solid Mensuration (also known as Solid Geometry) is the study of various solids. It is the study of the measure of volume, area, height, length, and many more. This subject is used extensively in the practice of engineering. The knowledge of this subject is a necessity to engineers in any project construction.
The study of coins is called numismatics.