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the fraction of the circle covered by the arc
The length of the major arc is r*x where r is the radius of the circle and x is the larger of the angles, measured in radians, formed at the centre by the radii from the two ends of the arc. If you measure angles in degrees, the length is r*x*pi/180.
length=n/360*2*pi*radius
To find the arc length, you also need to know the radius (or diameter) of the arc. The arc length is then found by finding the circumference of the full circle (2xPIxradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).