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The circles you are talking about are probably caused by irrigation systems. In the center of the circle there is a well and a long pipe suspended by a structure of steel supports on wheels that pivots from the well and moves in a circle around the well, irrigating the ground it reaches. In other words, a large sprinkler system. This is the common way to irrigate out west and other parts of the country, in fairly arid areas where farming would not thrive without it. It's a system that's been used for years. You can see for yourself on Google earth.
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Are circles considered squares?
No, they are not.
Do circles squares rectangles and triangles have bases?
Circles don't, but the others do, if you think of squares and rectangles as parallelograms.
Why are circles round?
Because of the lack of squares it has.
What are polyhedrons?
A polyhedron is a kind of rectangle. This category includes squares,circles,etc.
What solids have flat surfaces?
Circles, squares, rectangles, and triangles are solids that have a flat surface.
