Students learn how to find the equation of parallel and perpendicular lines in the form ax + by + c = 0.
Later, as learning progresses they link this to problems involving Pythagoras' Theorem and ratio.
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Key Stage 3 lesson on identifying lines of reflective symmetry in 2D shapes.
How to find the equation of parallel and perpendicular straight line graphs at A-Level.
AS Mathematics – How to work out the gradient and midpoint of line segments.