1. ABCD is a cyclic quadrilateral. Angle A, Angle B, and Angle C form an arithmetic sequence in this order. What is Angle D in degrees?
(An arithmetic sequence is a sequence where the difference between consecutive terms is constant. For example, 13, 15, 17 is an arithmetic sequence.)
2. Points A and B are on circle O such that arc AB is 80 degrees. A circle is constructed that passes through A, B, and O. Find the measure of arc AOB on this circle.
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