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.
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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.
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