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Semmy [17]
3 years ago
11

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)

Mathematics
2 answers:
alex41 [277]3 years ago
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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trasher [3.6K]

 

\displaystyle\bf\\Explanations:\\\\The~similarity~ratio~of~two~similar~cones=k\\\\k=is~the~ratio~between~2~corresponding~lengths\\\\k=\frac{R_1}{R_2}=\frac{h_1}{h_2}\\\\The~ratio~between~2~corresponding~areas~of~similar~cones=k^2\\\\\frac{Area~1}{Area~2}=k^2\\\\The~ratio~between~the~volumes~of~the~2~similar~cones=k^3\\\\\frac{Volume~1}{Volume~2}=k^3

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\displaystyle\bf\\Solving:\\\\Volume1=108~m^3\\\\Volume2=4m^3\\\\k^3=\frac{108}{4}\\\\k^3=27~~\Big|\sqrt{~}\\\\k=\sqrt[\b3]{27}\\\\k=3\\\\Area1=54~m^2\\\\\frac{Area~1}{Area~2}=k^2\\\\\frac{54}{Area~2}=3^2\\\\\frac{54}{Area~2}=9\\\\Area2=\frac{54}{9}\\\\\boxed{\bf Area2=6 m^2}

 

4 0
3 years ago
And I also need help in this one.
Dvinal [7]
Hey bestie I’m pretty sure it’s 1:3
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