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Essential Mathematics Year 9

Finding an angle (Trigonometry)

Pythagoras' theorem and trigonometry

09:09 Lesson length
8 Chapters
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Pythagoras' theor…
About this lesson
This is the next video in the series looking at Year 9 Triginometry. In. the previous videos, I looked at how to find the length of missing sides when we are given one side and an angle. Now we look at how we can find a missing angle when we are given two side lengths in a right angled triangle. There are worked examples to help explain the theory in an easy to understand way. Oh, and some humour of course!
Lesson chapters
  1. 00:10 — Welcome
  2. 01:00 — Learning objectives
  3. 03:03 — Recap of past learning
  4. 03:36 — Using a calculator to "reverse" a trig ration into an angle
  5. 05:20 — Ratios can be given as decimal values too!
  6. 06:24 — Example 1: Finding missing angles (Trigonometry)
  7. 07:54 — Example 2: Finding missing angles (Trigonometry)
  8. 08:36 — Final words
Video details
  • Title Finding an angle (Trigonometry)
  • Section Pythagoras' theorem and trigonometry
  • Course Essential Mathematics Year 9

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