Most branches of mathematics - including trigonometry - deal with numbers. The square root of three is a number.
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root word-trigonometria tri-three gonia-angle metron-measure
That's the definition of trigonometry. Triangles are completely dependent upon their side lengths, and can be defined by only three values.
Trigonometry is useful in buliding, amongst other professions and industries. Trigonometry is a branch of mathematics that deals with triangles, specifically right-angled triangles. It can be used to measure the angles of a triangle as well as all three sides, as long as two measurements are given.
comes from three Greek words; "tria"-three, "gonia"-angle, "metron"-measurement RAYMARK is online
It is a number - in trigonometry or elsewhere.