# What is curved?

## What Does curved Mean

The Latin word curvilineus came to our language as curvilinear . This adjective is used to qualify what is formed by curved lines . A curve , on the other hand, is that which is continuously moving away from the straight direction, without creating an angle.

The curvilinear angle , in this frame, is called the angle formed by curved lines . This means that its sides are not straight, but curved. If the angle has a curved line and a straight line, it is classified as mixtilinear.
A curvilinear motion , on the other hand, is a circular, oscillatory, or parabolic displacement . A racing car competing in a race on an oval-shaped circuit performs a curvilinear movement.

If the path along which a particle is moving is known to the observer, it is considered appropriate to describe the motion using the coordinate axes n (which acts as normal to the path) and t (is tangent to the path), and at the moment that they are considered to have their origin located in the particle. If the path is curved, then we can speak of an elliptical movement.
If we consider a particle moving on a plane on a fixed curve, at any instant you will be in the position s , which is measured taking into account the point O . For a coordinate system whose origin is a fixed point on the curve and at the observed instant it coincides with the position of the particle, the following will occur:
* the t axis will be tangent to the curve and positive in the direction in which s increases (the positive direction of the particle's displacement );
* said axis is perpendicular to n in its positive sense pointing towards the center of the curve;
* the plane that contains them both is called osculating or embracing . In a case like this, it would be fixed in the plane of displacement.
Since the particle is in motion, the position is a function of time. The direction of the velocity is always tangent to its path, and to calculate its magnitude it is necessary to derive the time from the path function.
If we have a curvilinear motion on an XY plane, with the corresponding axes and the determined origin , the magnitudes that describe it are a position vector at a given instant, and can be represented with the letters r and t , respectively. Let's not forget that along the entire trajectory of the particle, it will pass through a set of points; at each instant, one of them can be identified in relation to the instant.

In short, everything that has curves, or is characterized by them, can be referred to as curvilinear. For example: "The curvilinear layout of the circuit means that the cars cannot reach a great speed" , "The Finnish company surprised by presenting a curvilinear phone" , "The curvilinear container of the soft drink is very easy to grip" .
The idea of ​​curvilinear is often used with respect to female forms. When a woman has marked curves in her figure, it is said that she is curvy. This is an aesthetic feature that is usually considered attractive: "The Italian actress dazzled on the beach with her curvy body" , "The curvy figure of the model captivated the gallant, who barely saw her approached her to talk" , "I like women with a curvy silhouette ” .
The measurements that are often mentioned as the ideal of feminine beauty (90 centimeters of bust, 60 centimeters of waist and 90 centimeters of hips) are linked to curvy women . These different measurements suppose the existence of pronounced curves in the silhouette.

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