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Question

Consider the line
L1:x+13=y+21=z+12, L2:x21=y+22=z33
The shortest distance between L1 and L2 is

A
0
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B
173
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C
4153
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D
1753
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Solution

The correct option is C 1753
L1:x+13=y+21=z+12
L2:x21=y+22=z33
(x1,y1,z1)(1,2,1)
(x2,y2,z2)(2,2,3)
(l1,m1,n1)(3,1,2)
(l2,m2,n2)(1,2,3)

b1=l1^i+m1^j+n1^k
b2=l2^i+m2^j+n2^k
Shortest distance=(a2a1)b1×b2|b1×b2|
x2x1y2y1z2z1l1m1n1l2m2n2(m1n2n1m2)2+(m2l1l2m1)2+(n1l2l1n2)2
=1753units

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