Get the projection of l2 onto l1 using the dot product. Note that the length matters not just the direction.<BR>4. The perpendicular line segment passing through P is then the projection of l2 onto l1 ...
If lines are perpendicular to each other then \({m_1} \times {m_2} = - 1\) conversely if \({m_1} \times {m_2} = - 1\) then the lines are perpendicular to each other.
Higher - The gradients of two perpendicular lines will always multiply to make –1. Make sure you are familiar with finding the equation of a line and calculating gradient to understand equations of ...
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