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3 years ago

Find the slope of a line perpendicular to a line through the given points.. . E(5, 7), F(3 , 1)

2 answers:

6 0

Slope of perpendicular lines multiply to -1

find slope of this line

slope=(y2-y1)/(x2-x1)
(x,y)
(5,7)
(3,1)
slope=(1-7)/(3-5)=-6/-2=6/2=3

perpendular lines have slopes taht mutliply to -1
3 times what=-1
-1/3

slope of perpendiular is -1/3

Firdavs [7]3 years ago

6 0

Answer:

slope of perpendiular is -1/3

Step-by-step explanation:

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ΔABC has three sides with these lengths: AB = 9, BC = 40, and CA = 41. What is the value of cos C?

kotykmax [81]

Answer:

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Step-by-step explanation:

To find the $cos (C)$ we must use the cosine theorem.

The cosine theorem says that:

$c^2 = a^2 +b^2 -2abcos(C)$

In this case:

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$a=BC = 40$

$9^2 = 40^2 +41^2 -2(40)*(41)cos(C)$

$9^2- 40^2- 41^2 =-2(40)*(41)cos(C)$

$cos(C) = -\frac{9^2- 40^2- 41^2}{2(40)*(41)}$

$cos(C) =\frac{40}{41}\\\\cos(C)=0.976$

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