maths y9 trigonometry intro

What you'll learn

1. 1

   Imagine a ladder leaning against a wall. The ladder, the wall, and the ground make a right-angled triangle!

2. 2

   In a right-angled triangle, which side is the longest?

3. 3

   Here's a right-angled triangle with sides labelled: opposite (across from the angle), adjacent (next to the angle), and hypotenuse (longest).

4. 4

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

5. 5

   Drag the protractor to measure the angle in this triangle.

6. 6

   If the opposite side is 3 and the hypotenuse is 6, what is sin(θ)?

7. 7

   Which ratio uses opposite and adjacent?