Hello. I need help on this problem
Calculate the angle between parallelogram diagonals builded onto vectors and , if , and the angle
I will not do it for you. But I gladly give you these hints.
The diagonals of this parallelogram are .
Now you can put this all together. Maybe someone here who does other people’s work can understand this question and give you a complete solution. But if you really want to understand you will do it for yourself.
2. Maybe you can use the cosine rule to calculate the angle in question:
Let denote the angle included by the diagonals of the parallelogram. Then
Solve for and afterwards determine the value of .