Class 11MathematicsPair of straight linesAngle between the pair of straight lines, Condition for parallel and perpendicular lines
MediumThe equation $x^2 + k_1 y^2 + k_2 xy = 0$ represents a pair of perpendicular lines,if
- A$k_1 = -1$
- B$k_1 = 2k_2$
- C$2k_1 = k_2$
- DNone of these
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