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.
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the measure of a minor arc equals the measure of the central angle that intercepts it.
It depends on where arc AC is.
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The angle measure is: 90.01 degrees
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