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- P1(2,8,1)\mathrm { P } _ { 1 } ( - 2,8 , - 1 )

Question 40

Multiple Choice

 Calculate the direction of P1P2 and the midpoint of line segment P1P2\text { Calculate the direction of } \overrightarrow { P _ { 1 } P _ { 2 } } \text { and the midpoint of line segment } P _ { 1 } P _ { 2 } \text {. }
- P1(2,8,1) \mathrm { P } _ { 1 } ( - 2,8 , - 1 ) and P2(0,2,2) \mathrm { P } _ { 2 } ( 0,2,2 )


A) 27i+87j+17k;(1,4,12) \frac { 2 } { \sqrt { 7 } } \mathbf { i } + \frac { 8 } { \sqrt { 7 } } \mathbf { j } + \frac { 1 } { \sqrt { 7 } } \mathbf { k } ; \left( - 1,4 , - \frac { 1 } { 2 } \right)
B) 27i67j+37k;(0,1,1) \frac { 2 } { 7 } \mathbf { i } - \frac { 6 } { 7 } \mathbf { j } + \frac { 3 } { 7 } \mathbf { k } ; ( 0,1,1 )
C) 27i67j+37k;(1,5,12) \frac { 2 } { 7 } \mathbf { i } - \frac { 6 } { 7 } \mathrm { j } + \frac { 3 } { 7 } \mathbf { k } ; \left( - 1,5 , \frac { 1 } { 2 } \right)
D) 27i67j+37k;(1,5,12) \frac { 2 } { \sqrt { 7 } } \mathbf { i } - \frac { 6 } { \sqrt { 7 } } \mathbf { j } + \frac { 3 } { \sqrt { 7 } } \mathbf { k } ; \left( - 1,5 , \frac { 1 } { 2 } \right)

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