Class 11MathematicsPair of straight linesAngle between the pair of straight lines, Condition for parallel and perpendicular lines
MediumThe lines $ax^2+2hxy+by^2=0$ are at right angles if
- A$a+b=0$
- B$a+b=1$
- C$h^2-ab=0$
- D$a=b$
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DifficultAP EAMCET 2012
View SolutionThe angle between the lines given by $x^2 - y^2 = 0$ is ..... $^o$.
Easy
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