Trigonometry Basics: SOH CAH TOA & Ratios 📐

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*** WHAT'S COVERED ***
1. Identifying right-angled triangles.
2. Labelling the sides of a right-angled triangle.
* Identifying the Hypotenuse (H).
* Identifying the Opposite (O) and Adjacent (A) sides relative to a specific angle (x).
3. Introducing the three main trigonometric ratios.
* Sine (Sin)
* Cosine (Cos)
* Tangent (Tan)
4. Using the SOH CAH TOA mnemonic to remember trigonometric formulae.
5. Calculating unknown angles in right-angled triangles.
* Using inverse trigonometric functions (sin⁻¹, cos⁻¹, tan⁻¹).
6. Calculating unknown side lengths in right-angled triangles.

*** EXAM BOARD INFO ***
This video is suitable for maths courses around the world.
KS3 - Varies by school
GCSE Foundation - All on your course
GCSE Higher - All on your course
A-level - All on your course

*** CHAPTERS ***
0:00 Intro & Identifying Right-Angled Triangles
0:28 Labelling Sides
1:37 Introduction to Trigonometric Ratios (Sin, Cos, Tan)
1:47 Trigonometric formulae
2:05 Using SOH CAH TOA
3:11 Example 1: Finding an Unknown Angle
4:54 Using Inverse Tan Function (Tan⁻¹)
5:57 Example 2: Finding an Unknown Side
6:51 Rearranging the Cos Equation
7:26 Calculator Tip: Closing Brackets

*** PLAYLISTS ***
https://youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh&si=orIUwL3o2jOoiYjT

https://youtube.com/playlist?list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g&si=DcihOwUkd9oWbbdp

https://youtube.com/playlist?list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W&si=Y8MsO-FK948jnxpS

https://youtube.com/playlist?list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7&si=-7i5Iq7yOeJrhtu6

https://youtube.com/playlist?list=PLidqqIGKox7VKJD2WxRhoKaI6JGLVean8&si=NH_Q1ujhVgACM2FU

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