If we want to find the acute angle between two lines, we can convert the lines to standard vector form and then use the formula cos(theta)=(a•b)/(|a||b|), where a and b are the given vectors, a•b is the dot product of the vectors, |a| is the magnitude of the vector a (i
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Acute angle between the lines (vectors) (KristaKingMath)
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Angle Between 2 Lines, PDF, Angle
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Angle between two vectors (KristaKingMath)