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Mathematics 15 Online
OpenStudy (anonymous):

Suppose a triangle has sides a, b, and c, and that a2 + b2 > c2. Let be the measure of the angle opposite the side of length c. Which of the following must be true? Check all that apply. A. The triangle in question is a right triangle. B. cos > 0 C. cos < 0 D. is an acute angle.

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