The only way to find the area is to have two sides to multiply them together unless you have the hypotenuse.
A trapezium is a quadrilateral (has four sides). Two sides are parellel, but the other two are not. To find the area of it, the formula is: 1/2 h(a+b)
The polygon is a Quadrilateral.
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 you want the perimeter of a quadrilateral, then finding the midpoints is a complete waste of time! Simply add together the lengths of the four sides.
A quadrilateral has four sides, none of which have to be equal but, all could be. Specifying "irregular quadrilateral" includes the non-congruent-sided quadrilaterals but, would not exclude trapezoids that may have two congruent sides. I don't believe you will find a single word description...at least not in English.
4 times 4
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.
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You cannot. The length of the sides of a quadrilateral do not provide sufficient information to find its area. In the same way the a square can be distorted into a thinner and thinner rhombus with a smaller and smaller area, so can any quadrilateral.
A trapezium is a quadrilateral (has four sides). Two sides are parellel, but the other two are not. To find the area of it, the formula is: 1/2 h(a+b)
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.
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.
A quadrilateral has 4 sides but may not be symmetric. Bretschneider's formula provided a method using side lengths and two opposite angles. Any scalene quadrilateral can be divided into four triangles and the area is the sum of their areas. (see the related link below)
The polygon is a Quadrilateral.
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.
The answer will depend on the nature of the polygon and what is known about it.For a triangle, for example, there are formulae if you know 3 sides; or 2 sides and an angle; or 1 side and 2 angles. In the second case you can find the area but not the perimeter.In the case of a quadrilateral, you will require much more information, and for polygons with more sides, even more.