HSC Science (Electronics) 12th Board ExamMaharashtra State Board
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# Find the Shortest Distance Between the Lines (X+1)/7 = (Y + 1)/(-6) = (Z + 1)/1 and (X - 3)/1 = (Y - 5)/(-2) = (Z - 7)/1 - HSC Science (Electronics) 12th Board Exam - Mathematics and Statistics

ConceptPair of Straight Lines Pair of Lines Passing Through Origin - Combined Equation

#### Question

Find the shortest distance between the lines

(x+1)/7 = (y + 1)/(-6) = (z + 1)/1 and (x - 3)/1 = (y - 5)/(-2) = (z - 7)/1

#### Solution

Shortest distance between the lines

= 4(−6 + 2) − 6(7 − 1) + 8(−14 + 6)

= − 16 − 36 − 64

= − 116

and (b_1c_2 - b_2c_1)^2 + (c_1a_2 - c_2a_1)^2 + (a_1b_2 - a_2b_1)^2

= (−6 + 2)2 + (1 − 7)2 + (−14 + 6)2

= 16 + 36 + 64

= 116

∴ shortest distance between the given lines

|(-116)/sqrt(116)|

sqrt(116)

= 2sqrt(29) units

Is there an error in this question or solution?

#### APPEARS IN

2012-2013 (October) (with solutions)
Question 3.1.3 | 3.00 marks
Solution Find the Shortest Distance Between the Lines (X+1)/7 = (Y + 1)/(-6) = (Z + 1)/1 and (X - 3)/1 = (Y - 5)/(-2) = (Z - 7)/1 Concept: Pair of Straight Lines - Pair of Lines Passing Through Origin - Combined Equation.
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