Trigonometry
In mathematics, trigonometry deals with the relationship between the sides of triangles, and the function of the angles (trigonometric functions). 

According to Cortan Zweller, dom-jot involved just a little trigonometry and some minor wrist action. ()

The Doctor noted to B'Elanna Torres and Kes that his "daughter" Belle was extremely bright for her age, as she was already studying algebra and trigonometry. () 

The Doctor pointed out some fascinating trigonometric functions in the counterpoint of Jazz music towards a group of Qomar in 2376. ()

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de:Trigonometrie
Mathematics