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reflection
réflexion f

Reflection. Reflection is a geometric transformation of a plane in which points coincide with images by folding along the mirror line.

This shape is called a mirror image of the shape

Axis of reflection or mirror line

The shape and image are congruent. The line connecting any point P and its image P is always perpendicular to the mirror line and the distances PQ and PC are equal (see the figure).

A matrix can be used to represent the reflections of lines through the origin. Here are some of the simplest of these reflections:

Reflection in:

Axis ( x ( y=0

Axis (0=x) y

Line y=x

Line y=-x

0 (9) 1 1 0

Note: Points on the mirror line do not change their positions after reflection.

reflex
angle m rentrant

Reflex. The reflected angle is an angle greater than 180° but less than 360°.

reflexive
réflexif

Reflexive. The relation defined in a set is called reflexive if each member of the set is related to itself.

region
region f

Region. The network divides the flat plane into origins and origins are spaces enclosed within the arcs of the network.

This network has 4 origins including the one that is "outside" the network.

For example, the graph of the linear relationship x+y=5 linear divides A plane into two starting points. Each starting point can be specified by an order. In this case 5>xy and x+y>5 .

regular

regular. A regular polygon is a polygon in which all sides and all interior angles are equal. A regular triangle is a regular equilateral triangle (quadrilateral) and a square is an equilateral triangle (square).

A regular polyhedron is a solid in which all faces are regular congruent polygons.

There are only five regular solids: the tetrahedron, the cube, the octahedron, the dodecahedron, and the icosahedron.

A regular triangular pyramid consists of four equilateral triangles.