Categories > pair-st-lines > Angle between the pair of straight lines > If the acute angles between the pairs of lines $3{{x}^{2}}-7xy+4{{y}^{2}}=0$ and $6{{x}^{2}}-5xy+{{y}^{2}}=0$ be ${{\theta }_{1}}$ and ${{\theta }_{2}}$ respectively, then

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Question: If the acute angles between the pairs of lines $3{{x}^{2}}-7xy+4{{y}^{2}}=0$ and $6{{x}^{2}}-5xy+{{y}^{2}}=0$ be ${{\theta }_{1}}$ and ${{\theta }_{2}}$ respectively, then


1) ${{\theta }_{1}}={{\theta }_{2}}$
2) ${{\theta }_{1}}=2{{\theta }_{2}}$
3) $2{{\theta }_{1}}={{\theta }_{2}}$
4) None of these
Solution: Explanation: No Explanation
Angle between the pair of straight lines Condition for parallel and perpendicular lines

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