Linearity is the property of a mathematical relationship (function) that can be graphically represented as a straight line. Linearity is closely related to proportionality. Examples in physics include the linear relationship of voltage and current in an electrical conductor (Ohm's law), and the relationship of mass and weight. By contrast, more complicated relationships are nonlinear.
Generalized for functions in more than one dimension, linearity means the property of a function of being compatible with addition and scaling, also known as the superposition principle.
The word linear comes from Latin linearis, "pertaining to or resembling a line".
https://en.wikipedia.org/wiki/Linearity
Geometry (from the Ancient Greek: γεωμετρία; geo- "earth", -metron "measurement") is, with arithmetic, one of the oldest branches of mathematics. It is concerned with properties of space that are related with distance, shape, size, and relative position of figures.[1] A mathematician who works in the field of geometry is called a geometer.
https://en.wikipedia.org/wiki/Geometry
Trigonometry (from Greek trigōnon, "triangle" and metron, "measure"[1]) is a branch of mathematics that studies relationships between side lengths and angles of triangles.
https://en.wikipedia.org/wiki/Trigonometry
Algebra (from Arabic: الجبر, romanized: al-jabr, lit. 'reunion of broken parts,[1] bonesetting[2]') is one of the broad areas of mathematics, together with number theory, geometry and analysis.
https://en.wikipedia.org/wiki/Algebra
Calculus, originally called infinitesimal calculus or "the calculus of infinitesimals", is the mathematicalstudy of continuous change, in the same way that geometry is the study of shape and algebra is the study of generalizations of arithmetic operations.
https://en.wikipedia.org/wiki/Calculus
Probability is the branch of mathematics concerning numerical descriptions of how likely an event is to occur, or how likely it is that a proposition is true.
https://en.wikipedia.org/wiki/Probability
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