If you know the radius and the angle (in radians) then r*x where r = radius, x = angle.
If the angle is in degrees, then pi*r*x/180
Otherwise you have to measure it.
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The radius is a cord, is it not?
It just means length.
length of arc/length of circumference = angle at centre/360 Rearranging the equation gives: length of arc = (angle at centre*length of circumference)/360
No, in order to fine the arc length you need a formula which is: Circumference x arc measure/360 degrees
Arc measure is the number of radians. Two similar arcs could have the same arc measure. Arc length is particular to the individual arc. One must consider the radius of the arc in question then multiply the arc measure (in radians) times the radius to get the length.