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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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How do you find the measure of major arc?

To find the measure of a major arc in a circle, first determine the measure of the corresponding minor arc, which is the smaller arc connecting the same two endpoints. The measure of the major arc is then calculated by subtracting the measure of the minor arc from 360 degrees. For example, if the minor arc measures 120 degrees, the major arc would measure 360 - 120 = 240 degrees.


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"That would be A minor. Go a minor third below the tonic of the major scale to find the relative minor." Technically, there is no relative harmonic major to the key of C Major. The relative minor scale of C Major would the natural minor scale of A. A harmonic minor scale raises the 7th note of the scale a half step, giving us G#, which is not in the key of C Major.

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