Any value upto that of the diameter.
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Unless the chord is the diameter, there is no way to measure the radius of the circle. This is because the radius is in no way dependent on chord length since circles have infinite amount of chord lengths.
the chord is 4in long
A chord of a circle is a straight line that joins any two points on the circumference of a circle. The diameter of a circle is the length of the chord that passes through the centre of the circle; it is the chord of longest length and is twice the radius of the circle in length.
The length of a chord = pi*r*x/180 where x is the angle subtended. = pi*5*80/180 = 6.98 cm
Length of chord, l = 2*sqrt(r2- d2) where r is the radius of the circle and d is the perpendicular distance of the chord from the centre of the circle. l, r and d are measured in the same units of length.