Radius on a guitar usually refers to the slight curvature of the surface of some fretboards, the arc of which is part of an imaginary circle. The radius of that circle is 12 to 17 inches for most steel-string acoustic Guitars, smaller and hence more curved for some electrics. The only practical way to measure it is with a special gauge. If you had a diagram of it, you could calculate it with Pythagoreus' theorem. A straight line connecting the two sides of the fingerboard is the hypotenuse of a right triangle with two equal legs that are also radii.
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Of a circle: divide the length of the circumference by the value of Pi (about 3.14159). The answer is the diameter. Half of the diameter is the radius
50.24... the formula to calculate the area of a circle - is Pi x radius x radius Therefore 3.14 x 4 x 4 = 50.24
Circumference of a circle = 2*pi*radius or pi*diameter. 2*pi*2.250 = 14.13716694 metres.
You don't. You can calculate iits radius and cross-sectional area but its diameter has insufficient information to calculate its length
radius