Finding the acute angle between two lines (or between two vectors) — Krista King Math

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)