trigonometrical

Adjective

Meaning

Of or pertaining to trigonometry; performed by the rules of trigonometry.

Source: Webster's dictionary

mathematical arithmetic algebraic triangular analytical analytic trigonometric arithmetical triangulation trifid triangulate triadic three-sided triangularly goniometrical

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Astronomy, time-keeping and geography provided other motivations for geometrical and trigonometrical research. Source: Internet

This triangulation was the beginning of the great trigonometrical survey which was subsequently extended all over Britain. Source: Internet