Angle between Lines (Leaving Cert Mathematics): Quizzes

Inclination of one line relative to other

$\tan \theta = |\frac{m_2 - m_1}{1 + m_1m_2}|$

$m_1m_2 = -1$

$90^\circ$

$m_1 = m_2$

$0^\circ$

$90^\circ$

Yes, because $m_1 = m_2 = 3$

Identify the slopes of the lines

$|m_2|$

$1 + m_1m_2 \neq 0$