17 December 2012

17 December, S2 - 10/M1*

Title: Trigonometry
Learning Objectives 
Grade B
To be able to explain which is the correct trigonometric rule to use and use it to calculate the lengths of sides & angles in right-angled triangles.
How do you know which of the three rules to use?
Grade A
To be able to use the sine and cosine rules to calculate missing angles or sides in non right-angles triangles
When is it possible to use either of these rules?
Grade A*
To be able to calculate the area of a triangle using the formula: Area = ½ ab sin C.
What information do we need to do this calculation?

Resources 
Grade B






Grade A


Introduce the Sine Rule (noting it can be turned around).




Start by finding the length of a side.
On students are happy with this move on to examples of finding a missing angles.
Move on to the Cosine Rule (different ways around).

Move to a mix of questions

Further real life examples and proofs.

Grade A*
Area of any triangle

Introduce students to finding the area of triangles using the angle trigonometry formula.


Homework:
Complete the MyMaths D-C Booster Packs

Learning Objective for next lesson:

Grade B
To be able to explain which is the correct trigonometric rule to use and use it to calculate the lengths of sides & angles in right-angled triangles.
How do you know which of the three rules to use?
Grade A
To be able to use the sine and cosine rules to calculate missing angles or sides in non right-angles triangles
When is it possible to use either of these rules?
Grade A*
To be able to calculate the area of a triangle using the formula: Area = ½ ab sin C.
What information do we need to do this calculation?