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Formula for the acute angle between two lines based on their slopes, with graphical representation.

$Diagram showing the angle θ between two lines with slopes m₁ and m₂, using the formula tan θ = |(m₁ - m₂) / (1 + m₁m₂)|, with labels for parallel and perpendicular lines and a coordinate plane illustration.$

Diagram showing the angle θ between two lines with slopes m₁ and m₂, using the formula tan θ = |(m₁ - m₂) / (1 + m₁m₂)|, with labels for parallel and perpendicular lines and a coordinate plane illustration.

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(view all between the lines math worksheet)

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