Question

question 1 of 10
the law of cosines can only be applied to acute triangles.
a. true
b. false

Explanation:

The law of cosines (\(c^2 = a^2 + b^2 - 2ab\cos C\)) can be applied to any triangle (acute, obtuse, or right - angled). For example, in an obtuse triangle with an obtuse angle \(C\), \(\cos C\) will be negative, and the formula still holds to find the length of the side opposite the obtuse angle or to find an angle given the sides. So the statement that it can only be applied to acute triangles is false.

Answer:

B. False