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Alecsey [184]
3 years ago
8

Which of the following is a key element in the proof of the law of cosines?

Mathematics
2 answers:
Mariulka [41]3 years ago
4 0
The best and most correct answer among the choices provided by the question is the fourth choice "d=square root of (x^2+x^1)+(y^2-y^1)^2"
The law of cosines<span> for calculating one side of a triangle when the angle opposite and the other two sides are known. Can be used in conjunction with the </span>law<span> of sines to find all sides and angles. </span>

I hope my answer has come to your help. God bless and have a nice day ahead!
Vikentia [17]3 years ago
4 0

The <em><u>correct answer</u></em> is:

D) d=√((x+x¹)+(y²-y¹)² )

Explanation:

The distance formula is a key component to the proof of the law of cosines.

First we define sin θ = y/b and cos θ = x/b, using the standard law of cosines diagram.

We then use the distance formula, replacing the second y coordinate with 0 and the second x coordinate with a.

We then substitute our values for sin θ and cos θ, square them and simplify.

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Sorry my brain is fried...
KiRa [710]

Answer:

1:D,2

2:B:She found that -3(9) is positive

3:D:Evaluated -2^2 as -4

4:Confused, is there supposed to be supplemental info?

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Which one of the following formulas will find the sum of interior angles of a polygon with n sides
Yakvenalex [24]
<span><span>Each time we add a side (triangle to quadrilateral, quadrilateral to pentagon, etc), we </span>add another 180°<span> to the total of the interior angle.</span></span>  
Triangle, sum interior angle is 180
Square, is 360
Pentagon is 540  
So the formula is <span>180 ( n – 2 )</span>
7 0
3 years ago
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When you finally retire, you want to be able to draw from an account an annual salary of $100,000 for 20 years. Approximately ho
tankabanditka [31]
PV = P(1 - (1 + r)^-n) / r; where P is the periodic withdrawal = $100,000; r = rate = 5% = 0.05; n = number of periods = 20 years.

PV = 100000(1 - (1 + 0.05)^-20) / 0.05 = 100000(1 - 1.05^-20) / 0.05 = 100000(1 - 0.3769) / 0.05 = 100000(0.6231) / 0.05 = 100000(12.4622) = 1,246,221 ≈ $1,250,000
4 0
3 years ago
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find the slope of the line below. enter your answer as a fraction or decimal use a slash mark (/) as the fraction bar if necessa
Pie
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8 0
3 years ago
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If g(x)=|x-3|, find the values of g(3) and g(-3)
agasfer [191]
Plug in what ever value is the function of g for x and solve:
g(3) = |3-3| = |0| = 0
g(-3) = |(-3)-3| = |(-6)| = 6

Hope this helps :)

5 0
3 years ago
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