If the figure is irregular, you can't calculate its area (for example) with some simple formula. You need to use integration - which basically means to divide the figure into many narrow strips, which you assume to be rectangles.
a irregular figure is not a particular shape it may have two or more figures in to make a irregular figure
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Any irregular polygon does not have equal sides and equal interior angles
Area. Very few 2-dimensional figures can be measured by length and width - rectangles (and stretching the terminology) triangles and parallelograms. Certainly not circles, stars, irregular polygons, other irregular shapes.
water displacement
You get the Volume by using formulas. There is usually a specific formula to find the volume of each shape. Some irregular shapes may not have a formula.
You get the area by using formulas. There is usually a specific formula to find the area of each shape. Some irregular shaps may not have a formula.
an irregular figure is when it is open or have curved lines.
There is no such formula. To determine the area of an irregular plane shape split it into known shapes such as rectangles, triangles, segments of a circle etc. Determine the area(s) of each of these and sum the results to find the total area.
There is no formula. That's why it's called irregular!
by subtracting
a irregular figure is not a particular shape it may have two or more figures in to make a irregular figure
It depends on what kind of irregular shape you are talking about and the characteristics you want a formula for.
There is no general formula for all irregular polygons.
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There is no formula for measuring the volume of irregular shapes. The mass can be measured by using a weighing scale.