In geometry, a figure is designated as a rectangle that is composed of four sides, of which two have a length and the remaining two others, which also form four right angles of 90 °. It can then be said that a rectangle is a parallelogram, due to the fact that the two pairs of sides that compose it are respectively parallel.
Parallelograms on their side can be of different types, one of these types being the rectangular parallelograms, characterized by their internal angles being right, that is, 90 °, in this group it is possible to group the rectangle and the square, which are they differ from one another by the fact that the square has four equal sides, while the rectangle has only two.
As for the perimeter of this figure, it will be the result of the sum of all the sides that compose it. On the other hand, its area is calculated by multiplying the base by the height.
The rectangle has a series of characteristics that allow it to be differentiated from others, the first without a doubt is that its sides that are parallel to each other are two, while the diagonals it presents are similar and can be cut in equal parts.
The rectangles can be classified into three groups, firstly the irrational rectangles are located, which is made up of very varied rectangles as is the case of the Cordovan so named because said polygon was widely used by the architects of the mosque of Cordova. Also included here are the golden mean and the rectangle n.
In second place are the static ones, which are those composed of sides whose dimensions are whole, the best known of them being the Egyptian rectangle.
Finally, there are the dynamic rectangles, which can be obtained from the diagonal of a preliminary rectangle, which allows one of the sides that make it up to be maintained and the distance from the other side to take the place of the diagonal that belongs to the resulting rectangle.
On the other hand, the term is also used as a qualifier, specifically to name a type of triangle which has a right angle, but if on the contrary the triangle has an angle that exceeds 90 °, it will be classified as obtuse and if It is the case that all its sides are less than 90 °, it will be called an acute angle.
