Trigonometry of obtuse angles

A simple idea to get students working with trig values of angles greater than 90 and less than 0.  The idea is that they use their calculator (to chose sin or sin-¹) and then work with the symmetry of the graph to find the ordinate required. Download the ppt to click on the boxes to reveal answers one at a time.

Screen Shot 2018-02-21 at 17.13.10.png


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