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Trigonometry

Trigonometry. triangle measure. 1. measuring right-angled triangles. W hat can be said about these triangles? Can you find all the missing angles and sides?. 30°. 1 cm. 3cm. 30°. 0.5cm. 30°. 5cm. 2.5cm. 30°. B. c. A. a. b. C. which ratio? which sides/angles?

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Trigonometry

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  1. Trigonometry triangle measure

  2. 1. measuring right-angled triangles • What can be said about these triangles? Can you find all the missing angles and sides? 30° 1cm 3cm 30° 0.5cm 30° 5cm 2.5cm 30°

  3. B c A a b C

  4. which ratio? which sides/angles? • calculator use – sin or sin-1? • finding the length ‘on the bottom’ of the ratio • problem solving: where is the triangle?

  5. A practical problem • How high is ….

  6. Generalising trigonometric functions • How to interpret sin/cos/tan for angles greater than 90°? • unit circle app

  7. ‘special’ angles: 45°, 60°, 30° (π/4, π/3, π/6) 1 45° 1 60° 60°

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