أكاديميا - كولنز - معاجم الجيب العلمية - الرياضيات - انكليزي -فرنسي -عربي الحرف ٢_ e

Academia - Collins - Scientific Pocket Dictionaries - Mathematics - English - French - Arabic Letter 2_ E

ellipse
ellipse f

Ellipse. A flat curve belonging to the conic family. The ellipse has an eccentricity of less than 1.

If a cone is cut by a plane to form a cross section representing a closed curve, the cross section is an ellipse.

The ellipse can also be viewed as the locus of a point on a plane that moves such that the sum of the distances of the point from two fixed points, called foci, is constant.

The ellipse has two axes of symmetry called the major axis and the minor axis.
In the case of an ellipse whose major axis extends from (a,0-) to (a,0) and its minor axis from (b-0) to (0,b), the Cartesian equation is .

The foci are at (0,c) and (0, where a2-b2=C2 and the directrices are the lines.

The circle is a special case of the ellipse in which e=0. The area of ​​the ellipse is equal to πmb.

empty set
ensemble m vide

Empty set. An empty set, denoted by the symbol , is a set that does not contain numbers. For example: the set of female kings of England.

enlargement
grandissement m

Enlargement is the transformation of flat or solid shapes so that the shapes are superimposed on similar shapes using a center for enlargement.

The scale factor of enlargement is the ratio of the lengths of the object to the corresponding lengths in the image. The scale factor can also be viewed as the ratio of the dimensions between the center and the object to the corresponding dimensions between the center and the image.

The magnification centered at the origin can be represented in matrix form. For example: in a flat.

envelope
enveloppe f

Envelope . A tangential flat curve to each member of a complete family of curves .

The family of curves here are circles of radius
(radius) a and each of whose centers is b from a fixed point 0 .

This family has two envelopes, which are also circles, the radius (radius) of one is (b+a) and the radius (radius) of the other is (b-a) .

epicycloide m

External roll . External roll is the path drawn by a point P on the circumference of a circle that itself rotates on the circumference of another circle.

External roll forms "arcs" around the fixed circle. If the radii (radii) of the rotating and fixed circles are a and b respectively, the number of arcs of the curve is n when b=na .