Direction ratios - PowerPoint PPT Presentation

Vectors

Vectors. Addition is commutative. ( vi ) If vector u is multiplied by a scalar k , then the product k u is a vector in the same direction as u but k times the magnitude. Vector Directions. Hold your right hand out in front of you as if to shake hands.

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Analytical Solid Geometry

Analytical Solid Geometry. Concept of Octant. Z. P(x 1 , y 1 , z 1 ). . M. X. . . Y. O. Z. P(x 1 , y 1 , z 1 ). . Y. M. X. ELEMENTARY RESULTS. r. O. COS  ?. Let direction cosines of OP be l, m, n. Then OM = y 1. COS  = m = OM/OP  cos  = y 1 / r

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