radius
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Radius (r) is half the diameter. So 10.4 x 2 = 20.8in
The diameter of a circle is the length of the circle from one side to the other, going through the middle of the circle. The radius is the measurement of length from the middle of the circle to the perimeter of the circle. This is half of the diameter.
"One and a half inches" is approximately the same length as 38.1 millimeters (rounded), regardless whether it refers to a piece of string, a measurement of a geographic figure, or a blade of grass. A circle whose diameter is one and a half inches has an area of 1.767 square inches. (rounded)
no. its the inside Diameter is the measurement from one side of the circle, through the center, to the opposite side. Circumference is the measurement around the circle.
Diameter = distance across Radius = half the diameter Circumference = the diameter times pi Area = the radius squared times pi