<![CDATA[Math Is Fun Forum / Vectors]]> 2011-12-28T16:17:02Z FluxBB https://www.mathisfunforum.com/viewtopic.php?id=3075 <![CDATA[Re: Vectors]]> hi ganesh

only one problem??? o.O

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https://www.mathisfunforum.com/profile.php?id=118786 2011-12-28T16:17:02Z https://www.mathisfunforum.com/viewtopic.php?pid=197479#p197479
<![CDATA[Re: Vectors]]> i'd like to demand lots of vector proof problems, please! can't find enough of them.

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https://www.mathisfunforum.com/profile.php?id=1041 2007-11-06T21:16:27Z https://www.mathisfunforum.com/viewtopic.php?pid=82051#p82051

waise that was a bit easy one!

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https://www.mathisfunforum.com/profile.php?id=8178 2007-06-09T14:31:28Z https://www.mathisfunforum.com/viewtopic.php?pid=73740#p73740
<![CDATA[Re: Vectors]]> Very well done, luca-deltodesco! ]]>
https://www.mathisfunforum.com/profile.php?id=682 2006-05-15T08:09:28Z https://www.mathisfunforum.com/viewtopic.php?pid=34913#p34913
<![CDATA[Re: Vectors]]> a dot b = cosine of angle between them, cosine of 90 degrees is 0, so if a dot b is 0, they are perpendicular

a dot b = 2*5 + 3*-2 + 1*-4 = 10-6-4 = 0, a,b are perpendicular
a dot c = 2*10 + 3*-13 + 1*19 = 20 - 39 + 19 = 0, a,c are perpendicular
b dot c = 5*10 + -2*-13 + -4*19 = 50 + 26 - 76 = 0, b,c, are perpendicular

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https://www.mathisfunforum.com/profile.php?id=3758 2006-05-15T07:29:59Z https://www.mathisfunforum.com/viewtopic.php?pid=34905#p34905
<![CDATA[Vectors]]> V # 1

Show that the vetcors a = (2,3,1), b = (5,-2,-4), and c = (10,-13,19) are mutually perpendicular.

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https://www.mathisfunforum.com/profile.php?id=682 2006-03-07T06:33:44Z https://www.mathisfunforum.com/viewtopic.php?pid=30383#p30383