bhwilliams
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On which triangle can the law of cosines be used to find the length of an unknown side? Law of cosines: a2 = b2 + c2 – 2bccos(A) Triangle Q R S is shown. The length of Q R is s, the length of R S is q, and the length of Q S is 12. Angle R Q S is 36 degrees, angle Q S R is 57 degrees, and angle S R Q is 87 degrees. Triangle Q R S is shown. The length of Q R is s, the length of R S is 7, and the length of Q S is 12. Angle R S Q is 57 degrees. Triangle Q R S is shown. The length of Q R is s, the length of R S is 7, and the length of Q S is b. Angle R S Q is 57 degrees and angle S Q R is 36 degrees. Triangle Q R S is shown. The length of Q R is s, the length of R S is q, and the length of Q S is 12. Angle R Q S is 36 degrees and angle Q S R is 57 degrees. Mark this and return

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Thisguyishere

Answer:

It's B on edge

Step-by-step explanation:

a²=b²+c²-2bc Cos (a)

In this case , we can find the length of side a using the above cosine law.

If you are given the values of side b , c and angle a, then it is easy to calculate the length of side a.

To find side b,

b²=a²+c²-2ac Cos(b)

To find side c,

c²=b²+c²-2bc Cos (c)

Just the given values in the formula and get the length of the missing side. You can also find the missing angle using these formulas.

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