SOLUTION: A circle and an octagon share the same perimeter (circumference for the circle). If the side length of the octagon is, a, and the radius of the circle is, r, then what is the radiu

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: A circle and an octagon share the same perimeter (circumference for the circle). If the side length of the octagon is, a, and the radius of the circle is, r, then what is the radiu      Log On

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Question 1143384: A circle and an octagon share the same perimeter (circumference for the circle). If the side length of the octagon is, a, and the radius of the circle is, r, then what is the radius in terms of the side length of the octagon?

Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


The perimeter (circumference) of the circle is 2pi%28r%29; the perimeter of the octagon is 8a. So

2pi%28r%29+=+8a

Solve the equation for r....