Question

What is the formula of angle between two straight lines?

Answer

$\left(\mathrm{i}\right)\text{ tan θ}=\left|\frac{m_1–m_2}{1+m_1{m}_2}\right|$
$\left(\mathrm{ii}\right)\text{ Two lines are parallel if }{m}_1=m_2$
$\left(\mathrm{iii}\right)\text{ Two lines are perpendicular if }{m}_1{m}_2=1$

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