go to http://mathforum.org/library/drmath/sets/select/dm_area_irreg.html
that will most likely answer your question
or have a look at www.sketch n calc.com they have an online calculator
To find the density of a regular shaped object, you can calculate it by dividing the mass of the object by its volume. For irregular shaped objects, you would measure the mass of the object using a scale, then measure its displaced water volume when submerged in a graduated cylinder. The density can then be calculated by dividing the mass by the volume of water displaced.
For instance, you might divide the polygons into triangles, calculate the area of each triangle, and then add everything up.
The volume of irregularly shaped objects can be determined using the water displacement method. This involves submerging the object in a graduated cylinder or overflow container filled with water and measuring the volume of water displaced by the object. The volume of the displaced water equals the volume of the irregular object. This method is particularly useful for objects that do not have regular geometric shapes.
One way to find the volume of a large irregular shape object is to use the displacement method. Submerge the object in a container of water and measure the volume of water displaced. This volume is equal to the volume of the irregular object.
To find the area, first divide the shape into regular, simple shapes. Then use formulas to find the area of the smaller, regular shapes. Lastly, add up all the smaller areas to find the area of the original shape.
The water displacement method is used to find the volume of irregularly shaped objects. This method is not necessary for regularly shaped objects whose volume can be easily calculated using geometric formulas. Irregularly shaped objects do not have a straightforward formula for volume calculation, hence the need for the water displacement method.
For any irregular shape, you must divide it into shapes that are regular and find the area of those then add up all of the parts to find the area of the whole.
To find the area of any parallelogram, whether it be irregular or not, just multiply the base by the height. * Ap = bh
by subtracting
Liquid displacement
water displacement
water displacement