Topic 1 and 3, Tuesday 29 January
Geometry – topic 5
Exercises:
Stress test Wednesday 16 January
Solutions in 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
– Nonright 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 nonright 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 nonincluded 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).
 Use Sine rule, when given:
Geometry, step 2
Rightangled trigonometry:
Nonrightangled trigonometry
Pythagoras Theorem (also, in three dimensional problems)
Geometry 1
Homework for Tuesday 11 December
Revision
Wednesday 28 November
Valid Arguments
Example:
From these propositions I have constructed the following argument:
The argument in symbols:
———————
¬
Tuesday 27 November
With every implication there are three other statements that are associated.
If then:
 The inverse of is ¬ ¬
 The converse of is or
 The contrapositive of is ¬¬
You still use the words ”If…then…” from you propositions, but include ”not”, etc.
p. 248 8E 1a,b, 2,a,b. Then the examination questions, see post below.

Remember: An implication is only False when the antecedent is True and the consequent is False.