radius = diameter/2
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If you are given a chord length of a circle, unless you are given more information about the chord, you can not determine what the radius of the circle will be. This is because the chord length in a circle can vary from a length of (essentially) 0, up to a length of double the radius (the diameter). The best you can say about the radius if given the chord length, is that the length of the radius is at least as long has half half the chord length.
Radius is half the length from one side of a circle to the other or half the diameter.
(arc length / (radius * 2 * pi)) * 360 = angle
the circumference of a circle is the length around the outer edge. and you find it by using the formula 2 times pi times the radius of the circle
Radius of a circle= Perimeter of the circle/2*pi Radius is half the diameter Radius is the length of a straight line from the center point of the circle to the edge of the circle.