In this video I show you how the scalar product or dot product can be used to find the angle between two vectors.
IMPORTANT: Take note of the directions of the vectors.
Finding the interior angle of a triangle
In this video I show you how the scalar product or dot product can be used to find the interior angle of a triangle.
Example
- If A(2, -1, 4), B(-3, 2, 1) and C(5, 3, 2). Find the size of angle ABC.