Question

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What is the ratio of the radius of a circle to its circumference?

12π

1πr

1π

2π

Answer 1

This is how you set this up you give the radius of a circle an arbitrary value this can be any number im choosing 5. so we say r=5. the circumference of a circle is 2π r so the ratio between the radius and the cirumference is 5:10π you would then reduce it. You could also say r/2πr in which you could cancel out the r's.