Study notes
Pythagoras' Theorem & Trigonometry
Pythagoras' theorem (including its converse) and the sine, cosine, and tangent ratios for right-angled triangles.
What this topic covers
- Pythagoras' theorem relates the two legs and the hypotenuse
- Finding a missing leg means subtracting, not adding
- The converse checks whether a triangle is right-angled at all
- The three trig ratios link an angle to a pair of sides
- Pick the ratio that matches the two sides you actually have
- Finding an unknown angle uses the inverse ratio
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