koszinusztétellel
The Law of Cosines, known in Hungarian as the koszinusztétel, is a fundamental theorem in trigonometry that relates the lengths of the sides of a triangle to the cosine of one of its angles. It is a generalization of the Pythagorean theorem to arbitrary triangles.
The theorem states that for any triangle with sides of lengths a, b, and c, and with
The Law of Cosines is particularly useful in solving triangles when two sides and the included angle
The theorem can be derived using vector methods or by applying the Pythagorean theorem to right triangles