A wheel is circular to reduce friction with the road surface, and to allow a vehicle to move smoothly forward.
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A wheel is in the shape of a circle. The formula for the circumference of a circle is 2πr where r is the radius. But, the diameter of a circle is twice the radius so this equation can be written, Circumference = πd where d is the diameter. The Circumference is therefore π times as big as the diameter, π = 3.142 or 22/7 approx.
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Concentric Circles?
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The circumference of a circle is the distance arround the edge of the circle. The area of a circle is how big the inside of the circle is.