Question

If the triangle is not right-angled, and there is not a matching pair, you will need the _____________ Rule.

Answer 1

Answer:

Cosine

Step-by-step explanation:

If the triangle is not right-angled, and there is not a matching pair, you will need the Cosine Rule..

and the formula used will be: $a^2 = b^2 + c^2 - 2 b c cos A$

In the opposite case if the triangle is not right-angled, and there is a matching pair, you will need the Sine Rule..