Ha, this one I know from coordinate geometry! If the slopes are \( m_1 \) and \( m_2 \), you use the formula \( \tan \theta = \left| \frac{m_1 - m_2}{1 + m_1 m_2} \right| \). But you must remember, for parallel lines the angle is zero.
I was teaching this to a Class 10 student last week to earn for my own exam data. In the quiet of our wooden house, with my mother resting nearby, these formulas feel like old friends.
#exams#study
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