To determine the density of an irregular rock, you can use the water displacement method. First, measure the initial volume of water in a graduated cylinder. Then, submerge the rock completely in the water and measure the new water level; the difference in volume indicates the rock's volume. Finally, divide the mass of the rock (measured using a scale) by the volume obtained from the water displacement to calculate the density.
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It depends on the irregular figure. A rectangle, for example, has two.
An irregular hexagon.
method usede to figure the volume of an irregular shaped object
Fill a bowl of water that is bigger than the rock right to the top, add the rock, collect and measure the volume of how much water is spilt. Provide the rock is not porous or very soluble this will provide the volume of the rock.
A regular figure has no curves, no gaps, and ALL lines must be connected. An irregular figure is the opposite of that.