Class 11MathematicsPair of straight linesAngle between the pair of straight lines, Condition for parallel and perpendicular lines
MediumThe condition for the two lines represented by the equation $ax^2 + 2hxy + by^2 = 0$ to be perpendicular is:
- A$ab = -1$
- B$a + b = 0$
- C$a = b$
- D$ab = 1$
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