Straight LineHard
Question
The diagonal of the parallelogram whose sides are lx + my + n = 0, lx + my + n′ = 0, mx + ly + n = 0, mx + ly + n′ = 0 include an angle -
Options
A.
B.
C.π / 2
D.π / 3
More Straight Line Questions
If the equation x2 + y2 + 2gx + 2fy + 1 = 0represents a pair of lines, then -...Let the algebraic sum of the perpendicular distances from the points (3, 0), (0, 3) & (2, 2) to a variable straight line...The locus of the orthocentre of the triangle formed by the lines (1 + p)x - py + p(1 + p) = 0, (1 + q)x - qy + q(1 + q) ...Let PQ and MN be two straight lines touching the circle $x^{2} + y^{2} - 4x - 6y - 3 = 0$ at the points A and B respecti...ax − by − a2 = 0, where a, b are non-zero, is the equation to the straight line perpendicular to a line l an...