Question
Direction cosines of the line which is perpendicular to the lines whose direction ratios are 1, –1, 2 and 2, 1, –1 are given by :
Answer: Option A
:
A
If l, m, n are the d.c.’s of the line which is perpendicular to the given lines, then
l – m + 2n = 0 and 2l + m –n = 0
∴l1−2=m4+1=n1+2⇒l−1=m5=n3.
so d.r's =(−1,5,3)
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:
A
If l, m, n are the d.c.’s of the line which is perpendicular to the given lines, then
l – m + 2n = 0 and 2l + m –n = 0
∴l1−2=m4+1=n1+2⇒l−1=m5=n3.
so d.r's =(−1,5,3)
Was this answer helpful ?
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