Depending on your career, you may or may not need trigonometry. If your job does not require a lot of math, it is unlikely that you will use trigonometry very often, however, this is not a reason not to study it. The skills and discipline developed in your trigoometry class will help you no matter what career you choose.
Trigonometry is used in the fields of design, music, navigation, cartography, manufacturing, physics, optics, projectile motion, and any other field which involves angles, fields, waves, harmonics, and vectors.
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Trigonometry is used in design of everything from buildings to instruments to appliances. It is also used in electronics, acoustics, EM radiation, flight, navigation, projectile motion, and nearly every every application of waves and forces in physics and engineering.
Trigonometry is essential to the study of higher mathematics (calculus) and to the understanding of many scientific and engineering principles. Trigonometry and calculus can be used to model many shapes, motions, and functions in daily life.
There are very few real life examples of nonagons. The only examples that I can think of are a few coins.
some real life examples are a water bottle, pipes, cans
what is the application of trigonometry in your life and future carrier
ATOMS are real life examples of atoms. They do exist.
real life example of exterior angles
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There are many examples of daily life applications of real numbers. Some of these examples include clocks and calendars.
examples of quadratic equation in word problem form with real life situations like sports baseball, hockey
How large is a triangle? The real-life uses of trigonometry extend far beyond mere simple right-triangles into great expanses of scientific and engineering maths in everyday professional use, so "how" you would collect the data would depend on the specific study.