There is a hole in the ruler (i.e.) circle just make the circle using that
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Use the ruler to measure the size of the circle you want - this will be a line all the way across the whole circle. Then, measure a piece of string with the ruler -- make this half the size of the original line. Use a thumbtack to tack the string in the spot you want the middle of your circle. Use a bit of tape to tape the other end onto your pencil (don't wrap it around or you will end up with a smaller circle!) Gently move the pencil around the thumbtack to make your circle.
Make sure you are using the correct SI unit on the ruler.
u can't , its imposible.
hexagonal prism, a cone, and i believe circle or cylinder
Divide 7 by 8, using a calculator or a pencil, to get 0.875 .