**A**sk 10 high school students what is the “sin” function. If you are lucky some will recite a formula: opposite/hypotenuse.

Now ask what the result means: for instance if you say the sin(30) = 0.5, what does it mean? In other words, what 0.5 represents?

Well, if you someone tells it a percentage of the circle radius, you are indeed a lucky person.

This **site** — search for the words *Try it* — has a beautiful animation to demonstrate how it works. Note that when the angle is 30, the sine is 0.5, what represents 50% of the radius length. Simple, isn’t it?

SINE comes from the Latin SINUS, meaning a bend or gulf, or the bosom of a garment. Also, it has anatomical meaning: the cavities or bays in the facial bones.

**But wait! In Italian, ***sine* is seno that also means breast. In Portuguese, sine is *seno*, but breast is *seio* and bell is *sino*. All of then have to with the sine format, that resembles either a breast or a bell.

Tip: another great source to understand Maths instead of knowing formulas by heart is this one: **https://betterexplained.com/**

Sources:

http://mathforum.org/library/drmath/view/52578.html

http://stackoverflow.com/questions/6921520/using-qt-to-draw-the-graph-of-sinx

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