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obtuse
obtus

Obtuse. An obtuse angle is greater than 90° but less than 180°.

octagon
octagône m

Octagon. A polygon has eight sides and a regular octagon has equal sides, and each of its interior angles is 135°.

octahedron
octaèdre m

Octahedron. A polyhedron has two faces. A rectangular octagon consists of eight equilateral triangles.

odd
impair

odd. Chord. An odd number is not exactly divisible by 2. For example: 19.7 - 107 are odd numbers.
If n is a whole number, then 1+2n is always an odd number.

ogive
ogive f

Gothic arc The Gothic arc is another name for the cumulative frequency curve.

Gothic arcs are often in the form shown below:
Cumulative frequency
Data values

operation
operation f

Operation. An operation is a way of joining numbers together in a set. Binary operations combine two members of a set to produce a third member.

The study of abstract operations and their properties is an important branch of modern algebra.

order
ordre m

Order. 1 - The rank of a matrix is ​​the number of rows and columns in the matrix.

A matrix A has rank 2×3, which means it has two rows and three columns.

2 - The rank of a node in a network is the number of arcs that lead to that node.

Node order 1
Node order 3

3 - A figure that is identical to itself by reflection about n lines has line symmetry of order n .

A figure that is identical to itself in n ways by rotation about the same center 0 has rotational symmetry of order n about 0 .

A square has line symmetry of order 4
Rotational symmetry of order 3

4 - A group with n elements is a group of order n .

ordered pair
couple m ordonné

Ordered pair . A pair of numbers whose values ​​and order are significant is called an ordered pair. This expression is used specifically to refer to a pair of Cartesian coordinates that defines a point in a plane .

The ordered pairs (1.4) and (4.1) define two different points.

Ordered pairs, such as (H.T) and (H.H) ... etc., may also be used to determine the outcome of tossing two coins (heads and tails).

ordinate
ordonneé f

Second coordinate (y).

x-axis

P (4, 2)

y-axis

Second coordinate of 2=p of Q-3
Q (-1,-3)

origin
origine m

Origin. The origin is the point where the x- and y-axes meet and the coordinates of this point are (0.0), and the coordinates of all other points are measured in relation to the origin.

orthocentre
orthocentre m

Altitude intersection. The point of intersection of the altitudes of a triangle.

Altitude intersection

ounce
ounce f

Ounce. A unit of mass. One pound contains 16 ounces, and an ounce contains just over 28 grams.