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Sophia Learning
Sophia: Writing a Linear Equation From a Perpendicular Line and Point
This lesson presents how to write an equation of a line that passes through a given point and is perpendicular to a given line.
BBC
Bbc: Bitesize: Rectilinear Shapes
Find the gradient, equations and intersections of medians, altitudes and perpendicular bisectors using our knowledge of the mid-point as well as parallel and perpendicular lines.