well change it into another quadrilateral and then take away the area of the lines you added
You cannot. A square can be distorted into a rhombus without changing the lengths of any of the sides, but with a different area. Similarly, the shape of any quadrilateral can be altered without affecting the length of its sides but changing its area.
The area of the quadrilateral.
What do you mean by "length" as different from "side"? The multiplication will result in a number, that's it! Without knowing the angles and or the lengths of the other sides you have insufficient information to make any conclusions as to what that number represents. But if it is a right angled quadrilateral (a rectangle) you get the area.
Assuming "liths" is an unusual way of spelling lengths, you cannot because a quadrilateral is not a rigid shape. It can be deformed into a quadrilateral with the same sides but a different area. This can be illustrated by thinking of a square deforming into a rhombus. Same sides but different area.
Area
You cannot. A square can be distorted into a rhombus without changing the lengths of any of the sides, but with a different area. Similarly, the shape of any quadrilateral can be altered without affecting the length of its sides but changing its area.
With four sides given a quadrilateral is not clear defined. Infinite are possible. You need the length of one diagonal in addition to figure out the area.
You need to know the lengths of the sides and at least one angle or the length of a diagonal.
The area of the quadrilateral.
It is not possible to determine the area of a quadrilateral given only the length of its four sides.
What do you mean by "length" as different from "side"? The multiplication will result in a number, that's it! Without knowing the angles and or the lengths of the other sides you have insufficient information to make any conclusions as to what that number represents. But if it is a right angled quadrilateral (a rectangle) you get the area.
Assuming "liths" is an unusual way of spelling lengths, you cannot because a quadrilateral is not a rigid shape. It can be deformed into a quadrilateral with the same sides but a different area. This can be illustrated by thinking of a square deforming into a rhombus. Same sides but different area.
Area divided by length= width
To find the area of a quadrilateral, multiply the length and width of the figure. The product will give you the area of the figure.
If those are sides of a quadrilateral, you can't calculate the area - there is insufficient information. The same sides can be connected at different angles, resulting in different areas.
Area
You times (x) the length by the width on a quadrilateral. Other shapes are a bit different.