Because they have an infinite number of ways to self reflect
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As a number 1.7 million is 1,700,000 and so there are 5 circles or noughts
Circles with the same radius are congruent circles.
Concentric circles are circles with the same common centre.
Circles and rectangles are plane (2-dimensional) figures, so it doesn't seem that they can be used to construct solids.
Circles have a completely curved shape, and NO sides. So do ovals.