Answer:
B. The length of a side of a triangle is equal to the sum of the squares of the remaining two sides, plus twice the product of the two remaining sides and the cosine of the angle between them.
Step-by-step explanation:
This is the correct solution to your question.
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Kyle.
The law of cosine helps us to know the third side of a triangle when two sides are known. The phrase that best describes the law of cosine is option d,
The law of cosine helps us to know the third side of a triangle when two sides of the triangle are already known the angle opposite to the third side is given. It is given by the formula,
[tex]c =\sqrt{a^2 + b^2 -2ab\cdot Cos\theta}[/tex]
where
c is the third side of the triangle
a and b are the other two sides of the triangle,
and θ is the angle opposite to the third side, therefore, opposite to side c.
The phrase that best describes the law of cosine is option d, that is The square of any side of a triangle is equal to the sum of the squares of the remaining two sides, minus twice the product of the two remaining sides and the cosine of the angle between them.
Thus, The phrase that best describes the law of cosine is option d.
Learn more about the Law of Cosine:
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