What is the equation of an ellipse with a major axis of length 'a' and minor axis of length 'b' centered at the origin?
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What is the measure of an angle formed by an angle bisector that splits a 90° angle into two congruent angles?
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Math question: In a circle, if angle ABC is 120°, find the measure of angle ACB. (Hint: Use the Circle Theorem relating to angles in the same segment.)