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marusya05 [52]
3 years ago
8

Parallel lines intersect at an angle of 90. A. True B. False

Mathematics
2 answers:
Lisa [10]3 years ago
8 0
False because there are no parrelell lines
julsineya [31]3 years ago
7 0
False. 

Parallel lines never intersect. They're parallel. 
Take a look at this = sign. Notice the lines do not intersect rather, they follow each other. This is the same case with parallel lines. 
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I need help with this problem
Arada [10]

Answer:

65.56°

Step-by-step explanation:

We know that if we take dot product of two vectors then it is equal to the product of magnitudes of the vectors and cosine of the angle between them

That is let p and q be any two vectors and A be the angle between them

So, p·q=|p|*|q|*cosA

⇒cosA=\frac{u.v}{|u||v|}

Given u=-8i-3j and v=-8i+8j

|u|=\sqrt{(-8)^{2}+ (-3)^{2}} =8.544

|v|=\sqrt{(-8)^{2}+ (8)^{2}} =11.3137

let A be angle before u and v

therefore, cosA=\frac{u.v}{|u||v|}=\frac{(-8)*(-8)+(-3)*(8)}{8.544*11.3137} =\frac{40}{96.664}

⇒A=arccos(\frac{40}{96.664} )=arccos(0.4138 )=65.56

Therefore angle between u and v is 65.56°

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