THREE DIMENSIONAL GEOMETRY
Chapter 11: THREE DIMENSIONAL GEOMETRY · MATHEMATICS PART-2 · EN medium
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® Direction cosines of a line are the cosines of the angles made by the line with the positive directions of the coordinate axes. ® If l , m , n are the direction cosines of a line, then l + m + n = . ® Direction cosines of a line joining two points P( x , y , z ) and Q( x , y , z ) are where PQ =
📖 ncert book class 12 maths part 2 chapter 5 · Page 15
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® Direction cosines of a line are the cosines of the angles made by the line with the positive directions of the coordinate axes. ® If l , m , n are the direction cosines of a line, then l + m + n = . ® Direction cosines of a line joining two points P( x , y , z ) and Q( x , y , z ) are where PQ =
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