Criterion B: DEVELOPING IDEAS

1.  What strands ( learning engagements) are you expected to cover in criterion B?



2. When designing your storyboards, what are you expected to do to score highly in your designs?




3. Why is criterion B crucial in digital design?

Trigonometical Ratios

Basic Trigonometric Ratios

Trigonometry is mostly about following a set of rules, which need to be understood. No amount of working will help if the rules have been poorly understood..

The steps for any trigonometry problem are always the same:

1.             Find a right angle triangle to solve.

2.             Name the sides using the conventions below.                          

3.             If no angle is involved use Pythagoras theorem. Otherwise use  Trigonometrical Ratios.

4.             Choose the formula that gives uses the information that you have been given.

5.             Put the values into the formula and solve.

6.             Make sure the answer looks right.

If the triangle does not have a 90°, then you cannot use the rules of trigonometry given here. Instead the problem must be converted into one where there is one, or more, right angle triangles. This often involves some geometry.

name	ratio
sine	opp/hyp
cosine	adj/hyp
tangent	opp/adj

Naming Convention

Naming the sides correctly is key to Trigonometry, as picking the correct formulas depends on it.

The Hypotenuse can be the top, bottom, left or right side: what matters is that it is always opposite the right angle.

Always label the Hypotenuse first. This prevents confusion about which is the Adjacent, and makes sure that questions are not attempted on triangles without a right angle.