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
CIMT Interactive
Trigonometric Functions
Calculating Sides
Calculating Angles
Trigonometric Functions
Calculating Sides
Calculating Angles
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 three additional question from Ten Ticks - 9-10, 2, page 7
This must include one question from Part B.
Complete three additional question from Ten Ticks - 9-10, 2, page 7
This must include one question from Part B.
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?
