The largeness of the circle is an illustration of proportions
Using the assumed parameters, the circle must be 200 times larger than a normal circle
The question is incomplete; so I will make use of assumed values
Assume that a normal circle of radius r can take up to 50 toy cars.
When the normal circle is replaced by a larger circle of radius R to take up to 10000 toy cars, the size of the circle must be:
Size = 10000/50
Divide
Size = 200
This means that the circle must be 200 times larger than a normal circle
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