Answer:683 km
Step-by-step explanation:
When they talk about congruent polygons, they meant geometric figures that are all equal in shape and size.
It's angled, and the side length is equal too.
When you piled equal polygons, you'll end up with what we call prisms. It's the 3D form of a polygon.
If you stack squares, you'll have a cube.
If you stack octagons, you'll have an octagon prism.
A number rounded to the nearest 10000, means that the last four digits of that number (on the left of the decimal point) are 0.
<span>However, if the fourth-last digit to the left of the decimal point is 5 or greater, the number to the left of that is rounded to 1 number higher. For example, if you were rounding 145293 to the nearest 10000, it would be 150000.
However, the </span>fourth-last digit to the left of the decimal point in this case is 1.
Therefore, <span> 21000 rounded to the nearest 10000 is 20000.
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