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Mathematics 17 Online
OpenStudy (anonymous):

Suppose a triangle has sides a, b, and c, and that a2 + b2 < c2. Let x be the measure of the angle opposite the side of length c. Which of the following must be true? A. x is an obtuse angle. B. cos(x) < 0 C. The triangle is a right triangle. D. The triangle is not a right triangle.

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