Right-Angled Trigonometry (F)
Trigonometry is the final jigsaw piece that brings together everything that matters to do with right-angled triangles. Pythagoras' Theorem works when we know two sides and need to find the third, and our basic angle facts allow us to work out the missing angle if we know two of them. Trigonometry is used when we have an angle and a side – from this, we can work out all the missing lengths. This GCSE Maths quiz will test you on sine, cosine and tangent.
Right-angled trigonometry is usually remembered by the mnemonic SOH CAH TOA. In order to use it correctly, you also need to label the sides as Opposite or Adjacent to the angle given, and don’t forget to label the Hypotenuse too. Tick off in SOH CAH TOA what you need to find out, the one with two ticks is the ratio to use.
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