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)

2 answers:

7 0

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.

I hope this will help you.

lapo4ka [179]3 years ago

3 0

Answer:

It's B on edge

Step-by-step explanation:

I got it right

Also, to everyone who is mad at the first person who answered this, they probably don't have edge and the person who asked the question didn't give a picture. They did their best

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$\text{Your question needs a correction} :$

Correct question : the width of a rectangle is half of the length. The area is 25 square meters. What is the perimeter ?

$\bold{ \: solution : - }$

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