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I am not positive but i think that a regular shaped object can be measured and an irregular can not Hope this helps :D
Regular object have equla sides and irregular dont
It is a regular three-dimensional object.
Volume of irregular or regular shape object is the space reserved by the object in any medium.
Partition (or divide) the irregular object into summation of regular objects and then calculate the volume.
string
Water displacement.
regular
Volume of irregular or regular shape object is the space reserved by the object in any medium.
Displacement
to measure an irregular object you fill a graduated cylinder part way with water, measure that in milliliters, put the object in, measure that in milliliters, then subtract the 1st measurement from the 2nd and convert the answer to cubic centimeters. 1 milliliter =1cubic centimeter
If the object is irregular the best way is to measure the volume of water it displaces when you immerse it completely in water.