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 March 17, 2015 HW Questions? March 17, 2015 March 17, 2015 March 17, 2015 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? March 17, 2015 How would you prove vectors are parallel? skew? coincident? intersect? If they intersect, find the acute angle between them. March 17, 2015 > __ > __ OA = OB = > __ Find BA March 17, 2015 Find the position vector of the point of intersection Find the acute angle between the vectors March 17, 2015 #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

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