The answer depends on the information that you have. If the arc subtends an angle of x radians in a circle with radius r cm, then the arc length is r*x cm.
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Since the minor arc is 30 degrees, the major arc is 330 degrees (360 - 30). So we have: 330 degrees : arc length 10 30 degrees : arc length x 330/30 = 10/x 11/1 = 10/x x = 10/11 x = 0.9 approximately So the length of the minor arc is approximately 0.9 units.
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It's 0.524 of the length of the radius.
If the radius of the circle is r units and the angle subtended by the arc at the centre is x radians, then the length of the arc is r*x units. If you are still working with angles measured in degrees, then the answer is r*pi*y/180 where the angle is y degrees. If r and x (or y) are not available, or cannot be deduced, then you cannot find the length of the arc.
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