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Unformatted text preview: Three Dimensional Coordinate Geometry Advanced Level Pure Mathematics Advanced Level Pure Mathematics Calculus II Chapter 7 Vectors 7.8 Vector Equation of a Straight Line 2 Chapter 10 Three Dimensional Coordinates Geometry 10.1 Basic Formulas 6 10.2 Equations of Straight Lines 6 10.3 Plane and Equation of a Plane 14 10.4 Coplanar Lines and Skew Lines 28 7.8 Vector Equation of a Straight Line c t a r + = , parameter scalar : t line straight on the point fixed a of ector position v : a vector direction : c Prepared by K. F. Ngai Page 1 10 Three Dimensional Coordinate Geometry Advanced Level Pure Mathematics line straight on point any of ector position v : r Remark ) ( a b t a r  + = or b t a t r + = ) 1 ( Example Find the vector equation of the straight line 1 , in the direction of k j i 2 2 + and passing through the point with position vector ) 3 , 2 , 1 ( . Solution Example Find the vector equation of the straight line through the point ) 4 , 5 , 3 ( in the direction of k j i + . Find also the point on this line which has i 4 as one component vector of its position vector. Solution Example Find the equation of the line joining the points ) 6 , 2 , 1 ( A and ) 3 , 8 , 4 ( B . Find the coordinates of the point of intersection of this line and the xy plane and the ratio in which xy plane divides AB . Solution Prepared by K. F. Ngai Page 2 Three Dimensional Coordinate Geometry Advanced Level Pure Mathematics Example Let ) , 7 , 8 ( = A and ) 3 , 1 , 2 ( = B . (a) Find the equation of the straight line AB . (b) Find the perpendicular distance from the point ) 9 , 7 , 4 ( P to the line AB . Find also the foot of perpendicular. Solution Example The line joining two points ) 1 , 8 , 1 ( P and ) 2 , 4 , 4 ( Q meets the  xz and  yz planes respectively at R and S . Find the coordinates of R and S and the ratios in which they divide PQ . Solution Prepared by K. F. Ngai Page 3 Three Dimensional Coordinate Geometry Advanced Level Pure Mathematics Remark In above example (b), the distance from P to AB may also be found directly without calculating the foot of perpendicular. The method is outlined as follows: By referring to Figure, AB AP AB AP PR × = = θ sin Since Example By finding the foot of perpendicular from the point ) 13 , 1 , 10 ( P to the line, ) 5 (4 5 : j i t k i r L + + = , find the equation of straight line passing through P and perpendicular to L , find the perpendicular distance from P to L . Solution Prepared by K. F. Ngai Page 4 Three Dimensional Coordinate Geometry Advanced Level Pure Mathematics Three Dimensional Coordinate Geometry 10.1 Basic Formula The Distance Between Two Points Distance between ) , , ( 1 1 1 z y x A and ) , , ( 2 2 2 z y x B is 2 2 1 2 2 1 2 2 1 ) ( ) ( ) ( z z y y x x + + ....
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This note was uploaded on 11/26/2011 for the course COMPUTER S 1003 taught by Professor Angelosstavrou during the Spring '11 term at King Saud University.
 Spring '11
 AngelosStavrou

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