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adrianna74
02.08.2019 •
Mathematics
Which of the following vectors are orthogonal to (-1,3)? a. (-6,-2) b. (-2,-3) c. (1,3) d. (3,1)
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Ответ:
.. A (-6, -2)
.. D (3, 1)
The dot-product of these with (-1, 3) is zero:
(-6*-1 +-2*3) = 6 -6 = 0
(3*-1 +1*3) = -3 +3 = 0
You can make a vector orthogonal to a 2-D vector by swapping the coordinates and negating one of them. When you swap the elements of (-1, 3) you get (3, -1). It is usually convenient to negate the one that is already negative, so that would give you (3, 1) as the orthogonal vector.
Ответ:
the height of the building is 60.08 feet