The circumference of a circle can be found from two different starting points, namely from the diameter or the radius. In your case, the formula you can use right away is Circumference = 2 * pi * radius, giving you a circumference of 12*pi, or approx. 37.7 metres. If you prefer working from the diameter, the formula is Circumference = pi * diameter. To calculate the diameter, double the radius to get 12, and then substitute into the formula. You will again get 12*pi as your answer.
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As the diameter of a circle is twice the radius, a circle with a 6-foot radius would have a diameter of 6 x 2 or 12 feet.
The circumference of a circle if the if the radius is 6 cm is: 37.7 cm
Area of a circle: pi*radius*radius
12 is the diameter if the radius is 6
A circle with a radius of 6 units has an area of 113.1 square units.