Vector proof q (1 Viewer)

[Anaya R]

Does anyone know how to prove Q3? I can show the magnitude but not anything else

 

[cossine]

Does anyone know how to prove Q3? I can show the magnitude but not anything else
View attachment 37623

Seems fairly easy. Why don't you construct two equations involving HD?

 

[5uckerberg]

Here is my take on this question.

Let vector and

Exploit the fact that for a regular octagon suppose then theoretically and for a regular octagon we see that because these vectors are going in the same direction.
As a result of out first statement, we said that and .

Using that we can say .

 

[Anaya R]

Here is my take on this question.

Let vector and

Exploit the fact that for a regular octagon suppose then theoretically and for a regular octagon we see that because these vectors are going in the same direction.
As a result of out first statement, we said that and .

Using that we can say .

Oh
I had just overthought it - this is really helpful
Thank you!