Sunday 9 April 2017

Circumferences








YouTube brings a SAT question. 


We have a circle of radius that is 1/3 of the radius of another circle. 


They ask how many times the smaller circle goes around the bigger circle. 


The answer should be 3: 2 Pi r/3 would be the length of the circumference of the smaller circle. 


With this, we need to multiply it by 3 to get 2 Pi r, which is the circumference of the bigger circle. 


That means that the length of the smaller circumference will mean 3 turns over the bigger one for it to go back to the initial point. 


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