A cat chased after a dog for l mile, and then stop to rest. As soon as the cat sotped,the dog chased after the cat for 1500 yard
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Circumference of the smaller circle, using 
, is approximately equal to 18.85 (I used the high floating point precision approximation of pi my calculator has in memory, then rounded to 2 decimal points.)
Using the formula
, which in English says "the smaller circle's circumference is equal to 20% of the larger circle's", we can substitute the known value S: 
and solve for L: 
.
So the larger circle has a circumference approximately equal to 92.5 units.
Using the formula
So the larger circle has a circumference approximately equal to 92.5 units.