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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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) > 0D. cos (theta) < 0

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