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tangent
tangente f

Tangent. Tangent. 1 - Trigonometric function. The tangent of an angle in a right-angled triangle is the ratio:

opposite side/adjacent side

In triangle ABC

tan 0 = AB /BC = 3/ 8 = 0.375

The value of 0 can be found from the tangent function value table:
.°20.6=0

In triangle PQR

tan 55° = QR/ 6.2

However, the tangent function value table indicates that
tan 55°=1.43
Thus
QR/ 6.2 = 1.43
Thus QR=6.2×1.43=8.87

2 - A tangent to a curve at a point is a straight line that touches the curve at that point and has the same gradient as the curve at that point. If the coordinates P are (a.b) and the gradient of the curve at P is m, then the equation of the tangent at P is: (y-b=m(x-a .

terminating
exact

finite . A finite decimal fraction is a fraction with a finite number of decimal digits. For example: 0.41 and 1.825
and 0.1629385794 .
All finite decimal fractions are equal to fractions with denominators whose prime factors are from the set (2.5). For example:

3/40 = 0.075
0.056 = 7/125
13/2000 = 0.065

tessellation
arrangement m en damier

Trebled . A regular pattern of stones or bricks covering a surface.

tetrahedron
tetraèdre m

Triangular pyramid . A polyhedron with four triangular faces.

theorem
theorem m

Theorem. A general conclusion with meaning (moral) obtained by logical induction from certain assumptions called hypotheses. For example: Pythagoras' theorem.

tonne
tonne f

ton. A unit of mass equal to 1000 kilograms.

This car has a mass of approximately one ton.

topology
topologie f

Topology. The study of certain geometric properties of shapes that do not change under certain types of transformations.

The properties of simple flat networks, such as the number and types of nodes, the number of arcs, etc., are topological properties that do not change under the transformations under consideration.

torus
tore m

torus. A doughnut-shaped surface.
The result of rotating a circle of radius a in space around an axis located in the plane of the circle and at a distance b from the center of the circle.

Surface area = 4π2ab
Volume = π2a2b