Half the distance across a circle.
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The radius of a circle is half the diameter.
with a big tape measure
measure it÷ it by 2.
Measure the diametre of the circle and divide by two to give the radius.
you have a triangle formed by the radius on 2 and the chord on the other. the angle in that triangle that is opposite the chord, find its measure in radians take that measure (in radians) and multiply it by the radius to get the arc length