# What is breast?

## What Does breast Mean

Sinus , a concept with etymological origin in the Latin word sinus , has various uses. The first meaning recognized by the dictionary of the Royal Spanish Academy ( RAE ) refers to the hole , the hole or the opening of something. By extension, the idea of ​​breast is associated with the interior of a thing .

For example: “The native inhabitants believed that terrible monsters lived in the bosom of the volcano” , “The oil sprouted from the bosom of the earth and nothing was the same in the region anymore” , “We cannot allow such harmful attitudes in the bosom of our community ” .
The term breast also refers to a woman's breast . In this way, the breasts can be associated with the breasts or the mammary glands : "The model caused a stir by parading with her breasts exposed" , "It is important that, when showering, women feel their breasts for eventual early detection of breast cancer ” , “ The ball hit me in the left breast ” .

From this meaning, bosom is used to name the mother's lap or everything that provides shelter, help or protection : “Doña Elvira kept her grandson in her bosom for hours, until the little one calmed down” , “I'm grateful to this country that welcomed me into its bosom when I arrived escaping from the war ” , “ When faced with a problem, a child always goes to the bosom of his mother ” .
In the context of mathematics , the sine is a trigonometric function of a right triangle, which is calculated from the division of the opposite leg by the hypotenuse. Thus, the sine of a triangle whose opposite leg is 20 centimeters and its hypotenuse 60 centimeters is equal to 0.33 .
Trigonometry defines the law of sines as a relationship of proportionality (that is, a constant ratio or relationship between quantities that can be measured) between the length of each side of a triangle and the sine of each respective opposite angle. This is also known as the sine theorem and is usually presented with the following definition: if in the triangle ABC (the names of its angles) we understand that a, b, and c are the lengths of their opposite sides, we can say that a / no A = b / sin B = c / no C .
Angles A, B, and C can also appear as α, β, and γ (alpha, beta, and gamma), the first three letters of the Greek alphabet. It is worth mentioning that not many know his proof , despite the fact that it is very simple and is one of the most widely used trigonometric laws. Let us, therefore, see his demonstration. First we must draw the triangle ABC and denote its circumcenter O, that is, the center of its circumscribed circumference , which in this case is defined as the one that passes through all the vertices of the triangle, and also draw said circumference.

The next step is to draw a line that contains segment BO and continues until it crosses side AC and cuts the circumference, to give the diameter BP. At this point we should be looking at a right triangle, PCB. Angles P and A are congruent, since the two are inscribed and open BC. An inscribed angle is convex and its vertex is in a circumference, in addition to being constituted by semi-straight chords or secants of it. All this gives rise to the following equality, according to the sine function: sin A = sin P = BC / BP = a / 2R , where R is the radius.
Finally, by solving for 2R we can obtain a / sin A = 2R and if we repeat this with two other diameters, one from A and the other from C, we can confirm that all the resulting fractions are equal to 2R.

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