If the diameter is 5 feet then the radius is 2.5 feet. If the circumference is 5 feet then the radius is 0.79577 feet.
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5ft * Pi = Approximately 15.7ft
The radius of a circle is half the length of the diameter. Therefore, if the diameter is 1 foot, the radius would be 0.5 feet. This is because the radius is the distance from the center of the circle to any point on the circle's circumference, while the diameter is the distance across the circle passing through the center.
The circumference of circle with 2 foot radius is: about 12.57 feet. (c = r x 2 x Pi)
A circle with a radius of 5 units has an area of 78.54 square units.
The radius of the circle is the length between the middle of the circle and any of the sides. It is also half the lenght of the diameter.