Explain:

Asked by  | 15th Jun, 2009, 12:26: AM

Expert Answer:

a X b = c X d  (1)

and a X c = b X d  (2)

(2)-(1) gives:

a X (c-b) = (b-c) X d

a X (c-b) - (b-c) X d =0

aX (c-b) -  dX(c-b) =0

(a-d)X (c-b) =0

|a-d||b-c| sinΩ=0

as a  d and b  c.,sinΩ=0

Hence, Ω=0.Hence (a - d )|| (b - c )

 

 

Answered by  | 15th Jun, 2009, 03:19: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.