This page contains all questions and answers asked by students/ discussions from this class. The most recent questions will be at the top.
Recall the
![Rendered by QuickLaTeX.com a \bullet b = |a| |b| \mathrm{cos} \theta](https://theculture.sg/wp-content/ql-cache/quicklatex.com-c85add8da55c874d645ad9a3d98af670_l3.png)
If the angle is obtuse
![Rendered by QuickLaTeX.com \Rightarrow, \theta \in (\frac{\pi}{2}, \pi)](https://theculture.sg/wp-content/ql-cache/quicklatex.com-ec793a2db22c45f6e3c3b169f6038013_l3.png)
![Rendered by QuickLaTeX.com \mathrm{cos} \theta < 0](https://theculture.sg/wp-content/ql-cache/quicklatex.com-c49ba5cf6abf11f9616bfc008bee035f_l3.png)
Thus,
![Rendered by QuickLaTeX.com a \bullet b < 0](https://theculture.sg/wp-content/ql-cache/quicklatex.com-e15d944a15345009d111c17e5b068c1e_l3.png)
Vectors Q7 [Homework]
(i)
Using ratio theorem,
Since is perpendicular to
(ii)
To be a parallelogram,
(iii)
Let
Since
— (1)
— (2)
Solving,
Vectors Q9 [Homework]
(i)
Normal of
(ii)
Let be the acute angle
(iii)
— (1)
— (2)
Using GC,
(iv)
Let be the normal of
Length of projection
(v)
Required distance
(vi)
Let normal of
If intersect at l,
lies on
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