quiz1soln

quiz1soln - MATH 231 / Spring 2008 Name: Key 1. (3 points)...

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Unformatted text preview: MATH 231 / Spring 2008 Name: Key 1. (3 points) What is the equation of a sphere with center (h, k, l) and radius r? Solution: (x - h)2 + (y - k)2 + (z - l)2 = r2 January 23, 2008 - - - - - - - - - - 2. (7 points) If A, B, and C are vertices of a triangle, what is AB+ BC + CA? What about AB- CB- AC? Solution: We know that, in order to add vectors, we simply add them tip to tail. Thus, - - - - - - - - AB + BC + CA = AC + CA = 0 - - - - - - Furthermore, since -CB = BC and -AC = CA, the second question simplifies to the first. - - - - - - - - - - - AB - CB - AC = AB + BC + CA = 0 1 ...
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This homework help was uploaded on 04/17/2008 for the course MATH 231 taught by Professor Bociu during the Spring '08 term at UVA.

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