MathsYears 10–11Geometry - Properties of Shapes

Trigonometry (SOH CAH TOA)

Use sine, cosine and tangent ratios to find missing sides and angles in right-angled triangles

What you'll learn

  1. 1

    Imagine a right-angled triangle 🧩. SOH CAH TOA is a secret code to find missing sides or angles!

  2. 2

    Label the sides of this triangle: opposite, adjacent, and hypotenuse.

  3. 3

    Let's find the missing side using SOH CAH TOA.

  4. 4

    Which trig ratio uses opposite and adjacent?

  5. 5

    Use TOA to find the missing side — angle 45°, opposite = 8, adjacent = ?

  6. 6

    If sin(θ) = 0.5 and hypotenuse = 20, what is the opposite side?

  7. 7

    What does CAH stand for?

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