Life after mock

Well done during mock!

Now it is only one way to go – forward! You can do it!

In Sharepoint there is a new folder in the folder ”revision exercises”. It is called ”After mock”. There you can find Paper 1 and Paper 2, solutions and new revision exercises. The sooner you can start to revise the better.

Link to Sharepoint.

Tuesday 8 January

Welcome back to school!

In Onenote you can find the plan for week 2 – 10.

In Sharepoint you can find summaries for every topic included in the syllabus.

Today we will go through two examination questions involvning:

– Pythagoras Theorem
– Right angled trigonometry
– Non-right angled trigonometry

The questions can be found in Sharepoint, question 2 and 3.

Remember:

  • Pythagoras Theorem can only be applied on right angled triangles, and only to find length of a side.
  • ”SOH CAH TOA” can only be applied on right angled triangles, and involves relations between angles and length of sides.
  • Sine rule and Cosine rule are applied on non-right angled triangles.
    • Use Sine rule, when given:
      – Two angles and one side (to find length of another side). (If you know two angles, you also know the third…)
      – Two sides and a non-included angle (to find the size of another angle).
    • Use Cosine rule when given:
      – Two sides and an included angle (to find the length of the third side).
      – Three sides (to find the size of an angle).

Wednesday 28 November

Valid Arguments

An argument consists of a premise and a conclusion.
If the truth table for an argument leads to a tautology, then the argument is valid.
Example:
Consider the following propositions…:
p: It rains
q: You stay indoors
And their negations:
¬p: It does not rain
¬q: You do not stay indoors
From these propositions I have constructed the following argument:
If it rains then you stay indoors.
It does not rain.
             Therefore, you do not stay indoors.
”If it rains then you stay indoors.
It does not rain”. – The premise.
            ”Therefore, you do not stay indoors.” – The conclusion.
The argument in symbols:
p \implies q
¬p
———————
¬q
What we need to show in a truth table is:
(p \implies q) ∧ ¬p \implies ¬q
to state whether it is a valid argument or not.
 P. 255, review set 8B, 7a. Then logic examination questions or revision exercises.