Week 17 – Precalculus 11

For week 17 we learned sine law and cosine law for trigonometry.

Sine law was used for acute and obtuse triangles when you know an angle and it’s opposite side.

Cosine law was used for obtuse and acute triangles when you know an angle and two sides but not the opposite side of the angle.

Sine law formula is the value of each side over the value of each angle equal each other.

Cosine law was an extended version of Pythagoras theorem. A square equals b square plus c square minus 2(c)(b)cosA

 

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