Trigonometry triangle measure. 1. measuring right-angled triangles What can be said about these triangles? Can you find all the missing angles and sides?

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Presentation transcript:

Trigonometry triangle measure

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

b a c A C B

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?

A practical problem How high is ….

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

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