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CIE A Level Maths: Pure 1復(fù)習(xí)筆記3.1.3 Non-Right-Angled Triangles

Category: A-level課程, 教材筆記, 福利干貨 Date: 2022年8月19日 上午10:00

Non-Right-Angled Triangles

What do I do if there isn’t a right?angle?

  • The Sine Rule, Cosine Rule and Area Formula can be used for ANY type of triangle
  • They can help us calculate missing side lengths, angles and area

5.1.3-Non-Right-Angled-Triangles-Diagram-1a

5.1.3-Non-Right-Angled-Triangles-Diagram-1b

5.1.3-Non-Right-Angled-Triangles-Diagram-1c

5.1.3-Non-Right-Angled-Triangles-Diagram-1d

How do I know which rule to use?

5.1.3-Non-Right-Angled-Triangles-Diagram-2

  • Once you know which rule to use, simply label your triangle, substitute in the values and rearrange if necessary

Exam Tip

  • If you are given two angles in a triangle, finding the missing angle by subtracting from 180° might help.
  • Make sure you are careful to pick the correct rule to use, you’ll need to remember all the rules as they aren’t in the formula booklet.
  • Make sure your calculator is in degree mode (D).
  • Always check your answers are sensible…
    • Have I remembered to square root at the end?
    • Have I remembered to use?-1?
  • Check if the question asks you to round your answer.

Worked Example

5.1.3-Non-Right-Angled-Triangles-Example-Diagram?5.1.3-Non-Right-Angled-Triangles-Example-Solution

 

 

 

 

 

 

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