An arc length is the measure of the distance along the curved line making up the arc. It is longer than the straight line distance between the two end points.
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If you have only the arc length then you cannot find the diameter.
The length of the arc is r*theta where r is the radius and theta the angle subtended by the arc at the centre of the circle. If you do not know theta (or cannot derive it), you cannot find the length of the arc.
length of arc/length of circumference = angle at centre/360 Rearranging the equation gives: length of arc = (angle at centre*length of circumference)/360
Find the circumference of the whole circle and then multiply that length by 95/360.
The length of an arc is the radius times the angle in radians that the arc subtends length = radius times angle in degrees times pi/180