11 HL: The Cosine Rule

Complete the following questions before our next class (all from the blue book).

Exercise 9A questions 2b, 4, 10, 13b
Exercise 9B questions 1b, 2b, 6, 8
Exercise 9C.1 questions 1ce, 2b, 3b, 4

11 HL: Vectors

Complete the following questions before our next class. (If you are certain that you can answer a question with ease you can skip it.)

Exercise 13C question 8
Exercise 13D question 4
Exercise 13E question 5
Exercise 13F.1 questions 1de, 8, 9 (you don’t need to use row reduction here)
Exercise 13F.2 questions 1de
Exercise 13F.3 question 1b (this is a challenge question)
Exercise 13G questions 1, 4a, 6, 11

11 HL: The Cross Product

Here are a couple of short questions that you might want to look at over the break. Have a great break everyone!

  1. Find the area of the triangle with vertices A(1, 1, 2), B(3, –1, 0), and C(0, –2, –1).
  2. Find a vector orthogonal to both \(\vec{a}=\begin{bmatrix}1\\2\\-2\end{bmatrix}\) and \(\vec{b}=\begin{bmatrix}3\\4\\1\end{bmatrix}\).

11 HL: Vector Equations of Lines

In class we looked at the question below.

  1. Find the distance of the point A(1, 3) to the line y = 2x − 2.

Here’s another to look at tonight.

  1. Find the distance of the point A(4, –1) to the line \[\vec{r}=\begin{bmatrix}2\\5\end{bmatrix}+\lambda \begin{bmatrix}-2\\1\end{bmatrix}.\]

While solving these, think about how a “purely vector” approach could be used here, and we’ll look at that sort of solution to these questions in class tomorrow.

11 HL: Vector Equations of Lines

We’ll look at these questions in class tomorrow, but if you want to get a head start, you can check out the questions below.

  1. Find the Cartesian equation of the line \[\vec{r}=\begin{bmatrix}4\\-1\end{bmatrix}+\lambda \begin{bmatrix}1\\2\end{bmatrix}\]
  2. Find a vector equation of the line passing through A(1, 3) and B(2, −1).