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![[Post New]](/templates/default/images/icon_minipost_new.gif) 7 May 2008 21:18:48 IST
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A tetrahedrom has vertices at O(0,0,0), A(1,2,1), B(2,1,3) and C(-1,1,2). Then the angle between the faces OAB and ABC will be??
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7 May 2008 21:20:21 IST
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Now that you have got three points on the plane so find the normal to both planes and hence the angles
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I AM NOT TOTALLY USELESS.. I CAN BE A BAD EXAMPLE!!
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