Question

Suppose a triangle has sides a, b, and c, and that a^2 + b^2 > c^2. Let θ 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. cosθ > 0
C. cos θ< 0
D. θ is an acute angle.

Answer 1

B

Answer 2

is that the only one?

Answer 3

yess