Magnitude (of a vector)
The magnitude of a vector A is the length of the vector A and is denoted by $|A|$.
For $\mathbf{v}=\binom{x}{y}$, the magnitude is found using Pythagoras: $$|\mathbf{v}|=\sqrt{x^2+y^2}$$
If $\overrightarrow{AB}=\binom{-7}{-4}$ then $$|\overrightarrow{AB}|=\sqrt{(-7)^2+(-4)^2}=\sqrt{65}\approx 8.06 \text{ (3 s.f.)}$$
Dot product
For $\mathbf{u}=\binom{u_1}{u_2}$ and $\mathbf{v}=\binom{v_1}{v_2}$, the dot product is $\mathbf{u}\cdot\mathbf{v}=u_1v_1+u_2v_2$.
Nice try, unfortunately this paywall isn't as easy to bypass as you think. Want to help devleop the site? Join the team at https://revisiondojo.com/join-us. exercitation voluptate cillum ullamco excepteur sint officia do tempor Lorem irure minim Lorem elit id voluptate reprehenderit voluptate laboris in nostrud qui non Lorem nostrud laborum culpa sit occaecat reprehenderit
Paywall
(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.
Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.