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# Trigonometry

 2 Trigonometry Using trigonometry to find the length of a side in a right angle triangle. Finding the size of an angle in a right angle triangle p402 Ex 28.01 find side p404 Ex 28.02 find angle p406 Ex 28.03 Applications p414 Ex 29.01 p132 Applications & trigonometry practice Solving Pythagoras and trigonometric application problems including elevation & depression problems, nagigation and berings Trigonometry   Khan Academy Trigonometry Video Iintroduction, Example, Another Example p412 Ex 29.01 3D Situations, p414 Ex 29.02 With angles, p417 Ex 29.03 Lines & Planes, p419 Ex 29.04 Planes, p420 Ex 29.05 Mixed p416 Ex 29.02 p419 Ex 29.03

## Finding a side

1) Label triangle

2) Cross of the irrelevant side

3) Select trig rule

4)Substitute in known values

5)Cover unknown & solve

6)Working rounding units

Form a triangle

Which trig rule?

## Angle Applications

A boat sails from port North for 2.8 km, then west for 4km
What is the bearing back to port now?
Form a triangle

Which trig rule?

Working

## Pythagoras 3D Applications

Pythagoras in a 3D shape with right angles

Find length EC

Find base Diagonal

## Trigonometry 3D Applications

Trig in a 3D shape with right angles

Find Angle CEG

Find base Diagonal

Find Angle

Review

## A Projection onto a Plane

The projection of a line AG onto a plane

Plane EFGH

Plane CDHG