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The angle between lines of slopes \( m_1 \) and \( m_2 \) is \( \theta = \tan^{-1}\pm\left(\frac{m_1 - m_2}{1 + m_1m_2}\right) \).
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The angle between lines of slopes \( m_1 \) and \( m_2 \) is \( \theta = \tan^{-1}\pm\left(\frac{m_1 - m_2}{1 + m_1m_2}\right) \).
11 more points to remember - sign in to see the rest.