A figure of speech
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It depends on the figure. if it is highly irregular put it in water and see how much it displaces. If it not just find the volume one piece at a time.
A pyramid is a solid figure with one vertix.
Rounded to one significant figure it becomes 20
1000 is written with one significant figure, with only the 1 being a significant figure.
5.63 converts to 6 as one significant figure.