Thursday, 18 July 2013

18 July Math Scribe summary

What we did today:
- Groups presented Cosine and Sine rules, and asked questions

Cos rule:
1. Included angle - The angle connected by two sides. etc A connected by b and c in the diagram below
2. Relation between pythagoras theorem and cosine rule:
c^2 = a^2 + b^2 - 2abcos90
As cosine 90 is 0,
c^2 = a^2 + b^2

- Derivation of area formula: 1/2 ab sinC

- Went through a few questions for trigonometry

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