A right triangle is one possibility.
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1. Unless there is a unit right after the number (like 7000 lbs), then there would be 4 significant figures.
5, if the trailing zeros are there to indicate the precision. 1 otherwise.
1534 to 1 significant figure is 2000.
654 rounded to one significant figure becomes 700.
10920 to 1 significant figure is 10000