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 is not a right triangle.
B. a^2+b^2-c^2=2abcos (theta)
C. cos (theta) > 0
D. cos (theta) < 0
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