How to find acute angle between two intersecting lines in vector form?

When two lines intersect we can determine the acute angle by using the formula of cosine θ equal to scalar product of two vectors divided by product of their length.

Angle Between Two Lines

What is the obtuse angle between the lines having the slopes 1/2 and -1/3? - Quora

Vectors. - ppt download

geometry - Confusion the plane bisecting the angle between two given planes containing origin - Mathematics Stack Exchange

Derive the formula the angle between two straight lines with slopes m_1 and m_2 hence the slope of the line which makes an angle frac{pi}{4} with the line x-2y+5=0.

Angle Between Two Planes - Formula, Vector Form, Examples, Cartesian Form, FAQs

Math Principles: Angle Bisector - Two Intersecting Lines

Lesson Explainer: Angle between Two Straight Lines in the Coordinate Plane

Question 12 - Find angle between planes r.(2i + 2j - 3k) = 5