KS4. Trigonometry. Pythagoras’ Theorem

Pythagoras’ Theorem is one of the most important (and oldest) theory in geometry. It is shown below and must be memorised:

We use it to find an unknown length of a side of the triangle when we know the two other lengths.



Let’s complete exercise 20 on pages 209 to 211 of the core textbook:

The answers are below:

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