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Nature. Shapes were there long before there was life on earth, or indeed, before there was the solar system.
NO You see that a rectangle has 2 long sides and 2 short side THAT IS HOW TO PROVE THE answer
not necessarily as long as they seem to be learning they are good to go.
Many shapes can make up a heptagon, as long as there are always seven sides. (They do not have to be of equal length.)
Yes. Ex: A 5"x4" rectangle has the same perimeter as an equilateral triangle with sides 6" long.