radius
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A radius of a circle is from the center to the edge. A diameter goes from edge to edge across the center, so the diameter is twice the radius. 8.5 feet. ■
The diameter is twice as long as the radius. d = 2r The diameter is basically a line through the center of a circle while a radius is from the center to the circumference of a circle.
The radius of a circle is half the length of its diameter. Therefore, if the diameter is 11.5 units, the radius would be half of 11.5, which is 5.75 units. The radius is the distance from the center of the circle to any point on its circumference.
The radius of a circle is the distance from the center to an outside edge of the circle. The diameter is the distance all the way across the circle. Therefore, the radius is half the value of the diameter.
Lets see: diameter is the longest line across a circle (goes through the center) radius is one half the diameter Pi is the ratio of the circumference to the diameter. (3.14159 .....)