Home › CBSE Class 12 (Commerce) › Mathematics › Three Dimensional Geometry › In the equation r = a + λb of a line, the vector…
In the equation r = a + λb of a line, the vector a is the position vector of:
Aa point on the line
Bthe normal to the line
Cthe slope of the line
Dthe length of the line
Answer & Solution
Correct answer: A. a point on the line
At λ = 0 the equation gives r = a, so a locates one known point on the line.
Related questions
A line with direction ratios (1, 2, 2) is perpendicular to the line with ratios:Parametric equations x = 1 + 2λ, y = 3 - λ, z = 4λ give direction ratios:The line r = (2i - j + 4k) + λ(i + 2j - k) has direction ratios:How many straight lines pass through two distinct points in space?What is the length of the segment from P(-2, 4, -5) to Q(1, 2, 3)?Lines through two disjoint pairs of four non coplanar points are:A unit vector along the common perpendicular of lines with directions b1, b2 is:If (b1 x b2) . (a2 - a1) = 0 for two lines, the lines are: