What is the radius (r) if the equation of a circle is x^2 + y^2 = 25?
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Math question: In triangle ABC, angle A measures 60 degrees and angle B measures 45 degrees. If the angle bisector of angle A intersects side BC at point D, what is the measure of angle ADB?
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Math question: What is the limit as x approaches 3 of (4x^2 + 5x - 1)?