Any 3-dimensional object whose faces are not all congruent, or in which they do come together at each vertex i the same configuration.
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you cut it into regular solids then figure out those then add them together
By integration - you divide the figure into many thin slices, and calculate the volume of each slice individually. The volume of each slice, again, can be calculated by integration: divide it into thin rectangles, and calculate the area of each rectangle. If you have a irregular solid figure just immerse it in water and measure the displacement. a la Archimedes
It depends on the irregular figure. A rectangle, for example, has two.
An irregular hexagon.
- has no dimensions