Angle between Two Lines
Let θ be the angle between two straight lines AB and AC whose direction cosines are given by l₁, m₁, n₁ and l₂, m₂, n₂ respectively. Then the angle between the lines AB and AC is given by cos θ = l₁ l₂ + m₁ m₂ + n₁ n₂.If the direction ratios of the two lines are a₁, b₁, Read more about Angle between Two Lines[…]