if A,B,C are the points (1,0,2),(0,3,1) and(5,2,0) respectively, find m angle abc.
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AB = (-1,3,-1)
BC = ( 5,-1,-1)
cos theta = -5 +3-1 )/√1+9+1 √25+1+1
= -3/√11√27
BC = ( 5,-1,-1)
cos theta = -5 +3-1 )/√1+9+1 √25+1+1
= -3/√11√27
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answer is in the picture above
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