A regular object is an object that can be measured easily. Like a cube of wood, or a rectangular eraser.
An irregular object is an object that can not be measured easily. Like a lump of clay or a rock because it has no exact measurements.
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We get the idea that an "irregular sphere" is not a sphere. At that point, we knowexactly what it isn't, but not much yet about what it is. So you have to reveal a lotmore about it before anyone can calculate its volume. Like, for example, less infoabout what the object is not like, and more definition of its actual shape.
Polygons can either be regular or irregular. A regular polygon is for example a octagon which has sides and angles that are all the same. Irregular they are not all the same.
Ensure you have the right measurment and the calculations are correct
Partly fill a container with a liquid and mark its level on the side of the container. Then submerge the irregular object in the liquid and mark the new level. The volume of the irregular object is the difference in the two volumes marked in the container. Obviously, you need to ensure that the object is not soluble in the liquid. A variation on this method is to start with a container that is on a collecting tray. Fill the container to the brim, then gently insert the object and measure the liquid that overflows into the tray. This method requires only one measurement of the liquid's volume but it also requires great care to ensure that the object is submerged gently and that the meniscus (if any) is the same before and after. Not easy to do.