# Precalc 1-2

```March 17, 2015
Precalc Warm Up # 1-2
put row # on WU
1. Find a unit vector and a vector of length 7 in the direction of
a = 8i + 4j - 3k
2. What angle does a make with the positive z axis
3. Find g so that the vectors are
a. parallel
b. perpendicular
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HW Questions?
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Formula Review:
How do you find the angle between vectors?
x = 5 + 2u
y = -3 + 5u
z = 2 -u
How do you find the distance between points?
(0,1,4) and (-2,9,11)
How do you find the angle a vector makes with
positive x axis?
How do you know if vectors are parallel?
Perpendicular?
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How would you prove vectors are
parallel?
skew?
coincident?
intersect?
If they intersect, find the acute angle between them.
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>
__
>
__
OA =
OB =
>
__
Find BA
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Find the position vector of the point of intersection
Find the acute angle between the vectors
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#1-2 p. 465 3,8,14,15,16,17,22
(These are in Revision Set C, which are
IB test style) The answers are further
in the back of the book.
Get into groups and help each other out.
We will have a group quiz this Friday
```