Brainliest answer to first ! select the angle that correctly completes the law of cosines for this triangle. 12^2+13^2-2(12)(13)cos__=5^2 answers in pic.

Option B is correct i.e,

Explanation:

Law of cosine is useful to find:

* The third side of a triangle when we know two sides and angle between them.

* The angles of a triangle when we know all three sides.

It can be either of these forms;

Given triangle ABC is right angle triangle.

Law of cosines for this triangle is,

since, , and .

then,

muyb ajo

step-by-step explanation:

jegosu

goog may be able to you find that answer