From Greek.Trigon comes from 3-sided figure, now known as a triangle.
Metry comes from measurement.
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I can give you several sentences.I have to take trigonometry next year.Trigonometry relates to triangles.I never did understand how to do that trigonometry problem.
Trig
Bartholomaeus Pitiscus is best known for his book called Trigonometria which was first published in Heidelburg in 1595. It consists of work on plane and spherical trigonometry. The book had the first recorded mention of the word "trigonometry".
root word-trigonometria tri-three gonia-angle metron-measure
It is a number - in trigonometry or elsewhere.