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.
an irregular figure is when it is open or have curved lines.
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.
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.