The diameter of any circle is twice the radius. Hence, for this particular circle, the diameter is 106.
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Area = pi*4.12 = 52.81017251 or about 53 square cm
The answer depends on what "53" is a measure of.
19 and 34
C = ~166.5 inches.
each rotation = circumference = (pi) x (diameter) = 20 pi inches(53 rotation/minute) x (20 (pi) inch/rotation) x (60 minute/hour) x ( 1 foot/12 inch) x (1 mile/5,280 feet) =(53 x 20 pi x 60)/(12 x 5,280) = 3.153miles/hour (rounded)