Problem 11 of 34geo-011
A circular fountain has a diameter of feet. What is the circumference of the fountain, in feet?
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Solution walkthrough1:29
- Circumference is the distance once around a circle. The diameter, feet, is the distance straight across.
- Unroll the circle: it is a bit more than diameters long. Exactly, , with .
- Here , so feet. That is about feet.
- uses as the radius in . and are areas, from with or .