# How to use a proportionality table?

### How to use a proportionality table?

One table reflects a situation of proportionality when the numbers in the second line are obtained by multiplying the corresponding numbers in the first line by the same number. (In this example this number is 2.5 because 5/2 = 2.5; 7.5/3 = 2.5; 10/4 = 2.5; …).

### How to understand proportionality?

A table is proportionality if to pass from the first line to the second line, one always multiplies by the same number, this number is then called coefficient of proportionality. We will say that the two quantities, corresponding to each row, are proportional.

### How to make a cross product to calculate a percentage?

In this case, do a cross product : sum amount with increase x 100/initial value. For example to 50 euros with application of percentage on an initial basis of 40 euros (translated by 100 in percentage), we obtain 125 (125% of the basic amount) in equivalence to the 50 euros.

### What is 3D Design?

This 3D design consists of creating a three-dimensional model in the X, Y, Z axes. It is made from the lines of a technical plan. T Rendering . It is the name given to the design that is responsible for generating an image from the lighting calculation.

### What are the key concepts in the design of civil engineering works?

This chapter only outlines the key concepts that are generally used in the design of civil engineering works. The weight of the structure of the house which applies to its foundations is a permanent load.

### How to make a 3D design?

This 3D design consists of creating a three-dimensional model in the X, Y, Z axes. It is made from the lines of a technical plan. T Rendering .

### What are Technical Rules?

The technical rules (also called “essential health and safety requirements”) are expressed in the form of an objective to be achieved. However, given the state of the art, the objectives they set may not be achieved. In this case, the machine must be designed to tend towards these objectives.