Trigonometry (from Ancient Greek τρίγωνον (trígōnon) ’triangle’, and μέτρον (métron) ‘measure’) is a branch of mathematics that studies relationships between side lengths and angles of triangles.
Bibliography
“Trigonometry.” 2022. Wikipedia, November. https://en.wikipedia.org/w/index.php?title=Trigonometry&oldid=1120924905.