MATH 210 Study Guide - Final Guide: Cross Product, Dot Product, Parallelogram

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13 Dec 2018
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Problem 1 solution: consider the triangle with vertices. A = (1, 3, 2), b = (2, 0, 4), c = (6, 2, 5). (a) find the area of this triangle. (b) determine whether or not it is a right triangle. Solution: (a) the area of the triangle is half the magnitude of the cross product of ab = h1, 3, 2i and bc = h4, 2, 1i, which represents the area of the parallelogram spanned by the two vectors. The cross product of these two vector is computed as follows: 2 1 (cid:12) (cid:12) (cid:12) (cid:12) (cid:12)(cid:12) (cid:12) N = [(3)( 1) ( 2)( 2)] [(1)( 1) (4)( 2)] + k [(1)( 2) (4)(3)] + k (cid:12) (cid:12)(cid:12) (cid:12) (cid:12) (cid:12)(cid:12) (cid:12) (cid:12) (cid:12)(cid:12) (cid:12) (cid:12) (cid:12)(cid:12) (cid:12) 1 (cid:12) (cid:12) (cid:12) (cid:12) (cid:12) (cid:12) (cid:12) A = (b) we note that the dot product of ab and bc is: Ab bc = h1, 3, 2i h4, 2, 1i.

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