Partition (or divide) the irregular object into summation of regular objects and then calculate the volume.
There is no such thing as an "irregular rectangle". To calculate the area of a rectangle - if that's what you mean - you multiply length x width.
For example, you can divide the polygon into triangles, and calculate the area of each triangle.
The most direct way to calculate the area of an irregular shape is to superimpose it on graph paper, and then count the number of complete squares that it covers, and for squares that are only partially covered, estimate how much of the square is covered to the nearest simple fraction (a half, a third etc.). If you want the surrounding area rather than the area of the shape itself, you could calculate the total area and then subtract the area of the shape.
irregular objects will sink due to uneven sides on the will not sink
Partition (or divide) the irregular object into summation of regular objects and then calculate the volume.
ask your teacher to help
There is no such thing as an "irregular rectangle". To calculate the area of a rectangle - if that's what you mean - you multiply length x width.
For example, you can divide the polygon into triangles, and calculate the area of each triangle.
You break it up into smaller shapes which are less irregular. If these are more regular, you can calculate their contribution to the perimeter, and their area. You can then add these together.
Break-up the irregular object into regular objects by dividing the area. Sum the volumes of these regions together.
Finding the area of an irregular shape is now quite easily done after watching the instructional video at [See related link below for the website] and it's for free
By integration. In general, if you have an irregular area, divide it into many small shapes, for example rectangles, which you know how to calculate.
The simplest way is to divide the pentagon into three triangles, calculate the area of each of them and sum the answers.
The most direct way to calculate the area of an irregular shape is to superimpose it on graph paper, and then count the number of complete squares that it covers, and for squares that are only partially covered, estimate how much of the square is covered to the nearest simple fraction (a half, a third etc.). If you want the surrounding area rather than the area of the shape itself, you could calculate the total area and then subtract the area of the shape.
It depends on the shape of the area you need to calculate. There are formulae for given shapes but not necessarily for irregular ones
There is no set formula.You have to "split" the irregular shape into regular shapes, use whatever dimensions you have and fit them into the formulas of the known shapes.Find the area of each split shape. Lastly, you add all the areas to give you the totl area of the irregular shape