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scatter diagram
diagramme m de dispersion

Scatter diagram. A diagram showing the continuous values ​​of two variables.

secant
sécante f

secant. trigonometric function. The secant of an angle in a right-angled triangle is the ratio:

hypotenuse / adjacent side

In triangle ABC

sec α = AC/ AB=10/8= 1.25 1

sec α=1/ cos α

The value of α can be determined by examining the table of values ​​of the secant function 36.9°=α

second
seconde f

second. 1 - A unit of time. There are 60 seconds in one minute.

2 - A circular unit of measurement. Each degree of angle can be divided into 60 minutes (1= 60°) and each minute into 60 seconds (1= 60°).

section
section f

section. The cross-section of a solid is the view of the shape of the body taken perpendicular to its axis of symmetry.

The cross-section of this prism is an equilateral triangle.

The cross-section of a cone is a circle

sector
secteur m

sector. The sector is a part of the circle enclosed between two radii (radii).

small sector
large sector

2
The area of ​​sector 0° is 0 =0/360x πR2

The arc length of sector 0° is 2πR× 360/0
where R is the radius (radius) of the circle.

segment
segment m

segment. The segment is a part of the circle cut by a chord.

When the chord passes through the center of the circle, the two segments are called semicircles.

Small piece
Large piece

self - inverse

auto inverse

Self-inverse. A number is said to be self-inverse if it joins itself to give the identity element of the set in a certain operation. For example:

The matrix is ​​self-inverse in matrix multiplication.

For example: element 2 is self-inverse in addition modulo . 4 because 2+2=0

semí -
demi -

semi. half. 1 - Semicircle A semicircle is formed

When the chord passes through the center of the circle.

Area = πR2 1/2
Arc length of the semicircle = πR

2 - The semi-interquartile range of a set of numbers is defined as: 1/2 (upper quartile - lower quartile).
For example:
1,3,7,8,9,10,12,13,17,20,27

Upper quartile = 17
Lower quartile = 7

Semi-range between the quartiles 1/2 (17-7) =5 =

sense
sens m

Direction. Direction is a word used in transformation operations. If a transformed shape is (flipped) as a result of the transformation, we say that a change in direction has occurred. Rotation, translation, enlargement, and shear do not change the direction of the shape, but reflection always does.