# Math

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 Author: Snoopy ID: 273896 Filename: Math Updated: 2014-05-10 00:58:35 Tags: math Folders: folder1 Description: for math 23 final and other math courses Show Answers:

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1. unit vector
vector v = vector v divided by the magnitude of the vector
2. magnitude
square root with all the numbers square inside
3. orthogonal
if a dot b(vectors) = 0 or pi/2 and are perpendicular
4. scalar is a number while vector isn't
5. dot product
take the same position in two vectors and then add then do the same for the others and add them up
6. angle between two vectors
vector a * vector b = magnitude of vector a * magnitude of vector b * cosine
7. parallel
theta = 0, vector a * vector b = magnitude of a and b. Or a cross product of b(both r vectors) =0 or pi
8. anti parallel
theta equal 180, dot product of vector a and b = - or magnitude a and b
9. cross product
10. when normal * vector does not equal zero, it isn't on the plane
11. a line in a xy plane is determined when a point on the line and the direction of the line are given
12. another way to determine if lines are parallel
take the direction vector from lines 1 and 2 and check if they are the same or multiple
13. perpendicular lines
find the variables t and s or some other variables, plug them in to determine if they are the same on both sides of the equation. which means they intersect
14. skew lines
neither perpendicular or parallel

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